So, I'm in a bit of a difficult situation
Two players in my campaign seem to be on the path to destabilise the campaign. One of them had their character blab to a team of enforcers with us that we were Inquisition, and we were unable to convince them that his character was insane, so we had to order them not to tell anyone. Furthermore, in a combat he fired his flamer at an enemy cultist, who was currently in melee combat with a PC assassin (both were on fire already, a scattered firebomb), and it would cover another PC, a scum, as well. Fortunately no damage was dealt to PCs thanks to successful dodges, but the cultist evaded the flames as well
After that, the scum, who had procurred a virus grenade from somewhere, chucked it into the middle of the melee combat. It detonated, and the resulting damage forced four PCs (himself included) to burn fate points to stay alive, and put two others into critical damage
The current penalties I have given are corruption points (1d10 for the PC with the flamer, 3d10 for the Scum) and 100 less XP for the session. Otherwise, I'm not sure how to proceed from here. The Inquisitor is going to be informed, and the local Adeptus Arbites is going to investigate why a tiny amount of the Life-Eater virus was unleashed in a mine, but other than that, what should I do?