S-4 almost tries to move away, but knows he needs to hold his arm, even with the nasty injury, if he wants to have a chance to heal it.

Thankfully, after a few moments, the relief overcomes the pain, and S-4 manages a soft smile as he keeps his magic coursing through Sans' arm, until he feels instinctively that there is nothing more he can do.

He almost asks if it's okay, but Sans shows him soon enough without him needing to ask. The arm looks to be completely healed, and Sans seems completely free of pain as well. S-4 allows himself another smile.

"I'm just glad you're okay now. It doesn't hurt anywhere else?"