Three, two- York ducks out of the alcove in time to watch Locus charge in Tucker's direction- between the yelling, the thudding of that wrong heart and the pounding of his clawed feet on the ground? It's hard to shout a warning.

Not that Tucker needs it, he's pinned.

"FELIX, FREEZE!" whether or not it'll even work on the zombie is entirely in question, but if he can give Tucker a moment to twist free, Locus a moment to act on his own? He'll try to buy it while the machine crackles, fizzes, and explodes a second time behind him.