Truth's player here. Mechanically the scene did work out fine. I wonder though, isn't seize by force meaning that both parties involved are already dealing harm to each other in the fiction, or are at least poised to deal each other harm? If Barker is just sauntering up to Truth, not expecting him to preemptively strike, isn't there an argument to be made that the situation is going aggro? The action was described as  suddenly grabbing Barker by his throat and ordering him to back off. I always took go aggro to mean trying to get someone to bend to your will by using the threat of imminent violence that the aggressor fully intends to follow through on. Or also attacking someone before violence has broken out in earnest, or attacking someone who isn't in a position to properly defend against the attack. I also always considered go aggro to cover the kind of violence that can end if circumstances are met, and not like, everyone on one side has been wiped out.
Like I said it totally worked out and I suppose Truth was physically seizing something, but just to play devil's advocate, does any one else see this as going aggro?

Hey this is a really great AP write up. I've been enjoying reading it. Thanks.