Carl and Donut's coordinated move: both go invisible, Donut switches to infrared, and all talking moves to chat.
Predator is one of Carl and Princess Donut's newer moves, built around the stockpile of invisibility potions Carl had been collecting and always keeping a few of on Donut. On the call, both crawlers drink invisibility potions, Donut switches to infrared vision using her sunglasses, and they stop speaking aloud entirely — she stays on his shoulder and calls out over party chat anything she sees that he might not.
Carl called Predator at the two-second mark of Bomo's teleport countdown into Zockau. Princess Donut pointed out that Predator is not a plan, it's a move.
The stealth tactic that gets Carl and Donut through Zockau undetected.