Ghaleon doesn't bother with a blade when going in to help Colin. The hole the engineer's fist had emerged from should be sufficient for what he has in mind.

"You may wish to hold still for a moment, Colin. I'd rather not be cut by mistake."

That's about all the warning anyone gets before Ghaleon starts ripping open that puncture as if he were ripping cloth along a tear. It offers about as much resistance as he expected; nothing overly much.