While the changelings or April or any other phobovores in the audience can probably pick up on the dread spilling from Bastion's processors, it takes more than killing one human-looking passenger barehanded in front of everyone and making long-winded but credible death threats towards everyone else to activate their combat protocols.

They will not be lying down and allowing themselves to be killed and their body repurposed, thank you. They won't contest that they're an asshole, but so is the individual piloting Friday's body, so she hasn't convinced them on that basis. They level their gun arm at Monday.