Rex never actually considers curing in the middle of a fight. When something is trying to kill him, his first instinct is to punch back, not lovingly stroke it into submission.

...Although lovingly stroking them is starting to sound like a good option yeah. For lack of any other options, he grits his teeth, pushes his hand into the nearest monster, and hopes he can cure it before it smacks him into a wall.

He nods at the other monster, the one that was pulled by tendrils. "You think there's another monster we're dealing with in here too?"