As soon as Carl's arms fall away from him, Coil pulls back into his own space enough to quickly drag his sleeve across his eye and shake his head. He doesn't know. But, that's a kneejerk answer. Give him a second for another steadying breath and he'll work on putting actual thought toward it.

First thing--he glances back toward the vacant room he'd just stepped out of. The communication panel he'd sent his message from looks a little more elaborate than the one in the Hospitality Deck, but it's still only barely functional. So, he turns back to Carl. He still looks shaky and deeply rattled, but being forced to put his mind toward selecting what signs to use always helps to level him out.

In this case, he opts for the most minimal way possible to get his thought across. When he brings up his hand to sign, it's immediately clear that his knuckles are bleeding and already beginning to swell, so he slowly spells out 'p-a-n-e-l' and gestures toward Carl. Maybe wherever Carl had messaged from had been better?