Luckily the arm is completely numb, so although he flinches a bit he can't... actually really feel the burning much. Just some of the unaffiliated skin further up his arm.

Once it's done the... purple at least doesn't seem to immediately be spreading past the charred skin. He grits his teeth in disgust, letting it drop to his side again.

"Thanks." He fishes in his pocket for the Swallow potion that Lambert passed onto him, fumbling it open with one hand and downing it quickly. It feels awful and he lets out a choked gasp after, just dropping the empty bottle and trying his healing spell once more.

He gestures towards Foster, for everyone else to just continue on while he collects himself.