Merrick is a dangerous man. He is especially dangerous to those whom he thinks pose a threat to the public, including all witches.
The "witchburns" on his face are the size of a small child's hands. That's interesting.
He is probably right about witches being dangerous to the public, but if Valentine is right, the number of witches is constant; nothing Merrick or the SSI can do can reduce the number of witches in the world. At most, killing them can make the population of 57 witches younger and more traumatized, and you get to hope that the ones you kill will be replaced by new ones cropping up where they are someone else's problem.
Younger, more traumatized witches are drastically more dangerous than older, secure, and non-terrified witches. Stiletta is your basic example.
Chester Merrick was the "point man" in Vogel's botched raid on Sera's house a few years ago, with the express purpose (explained by Vogel himself) of putting a bullet in her head with no warning. This was after she demonstrated "dangerousness" with the bus incident.
If her bed had been at floor level where they expected it, that probably would have been a successful mission and Sera would be dead. Now that they know her bed is floating near the ceiling, it won't protect her again in another raid.
Contessa Rubikov was held by Vogel as a hostage, in case the mission went pear-shaped (which it did) and he had a need to "bargain" with Serenity. He could have tried to get
her cooperation (in the form of not killing all the rest of his people) by threatening Tess's life. Serenity resolved the matter, by expelling but NOT killing his people, too abruptly for him to put this backup plan into play.
When Merrick asked Sera to come down to the Doldrums with him, at a particular time, there was probably an ambush waiting. He's never been near her without three vans full of guys in combat gear nearby, and he himself admits that the SSI has been aching for an excuse to take her out.
When he asked about an MRI or brain scan, he may have been ready to claim he was worried about schizophrenia - that Stiletta might have been an alternate-personality manifestation of Serenity. But if he could have gotten Sera to submit to a brain scan, he would probably have used a version of the machinery that would instantly kill her. Magnetic imaging coils replaced by a set 12-gage shotgun for example. The public is safer that way.
The "new facility" is a lie. Given what Witches can do there is no power on earth - probably not even another witch - that can hold them and make the public safe from their manifestations. Sera's dreams kept popping up in the cave, miles from where she was actually sleeping. The witch whose indigestion-powered dream ended the Napoleonic wars was asleep, at least a mile from the enemy lines. Likewise, the self-induced-comatose witch in Spain or wherever, whose hair has been seen gambling in Monaco. Even if you can hold a witch's body in one place, you can't protect the public from his or her ectoplasmic manifestations. It doesn't matter whether they're showing "Superbad" or "Juno" - if they're really holding witches securely and protecting the public from them, then they're showing them to dead witches.
When Sera was ready to turn herself in, Merrick said he hadn't even brought his gun. Not only had he brought his gun, he was ushering her into a room with 20 guys in full combat gear ready to take her out. He was closing the door to prevent people from seeing what was about to happen, and reaching for his gun, even before he noticed that Stiletta had broken in and killed his goons.
He has no eyes. He can see. Therefore either his goggles are spellcast, or he is. There is some witch that is cooperating with the SSI in order to do this for them. Possibly because of coercion (or a "plea bargain" or "community service" sentence) or possibly because of patriotism.
Witches have fundamental control of elemental forces, but the SSI has an "electrical disruptor" that undoes ectoplasm. The SSI also claims it can run "tests" to see which witch created a spellcast creature if they get that creature intact. I'm callling bullshit. The SSI have a witch working with them. I bet the lower-level SSI goons don't realize that; that's why the toys are disguised as technological.
The magic-disguised-as-technology thing is familiar from the history presented in "Goodbye Crestfallen" when Sera's going to talk to the trolls though; it looks like the sort of thing the "Science Master of the Super-Radio Gravity Belt" might have done. Is Atlan Samuel still around?
In order to protect yourself from things like the SSI, I would advise a young witch never to be a recluse and never to be alone without witnesses in a place controlled by the SSI. "Use the attention of the world" as Vicious says, and become someone whose death would be widely reported and the investigation of whose death would be followed by millions of people who'd cry "foul" if the investigators were suddenly called off.
Guadalupe