Seth winces a little at the touch, not used to anyone touching him unexpectedly for, well, positive reasons, though he quickly relaxes against it again. As much as he can relax at the moment, sitting on the floor and leaned over a toilet bowl while his stomach contracts.

Thankfully it doesn't last terribly long, what with having very few stomach contents to divulge, and this not actually being a reaction to anything digestive, just... well, the shock, he assumes.

"Sorry.." he says, once it seems like he won't be interrupted by stomach acid again. He's shaking more again, though at least now it makes sense why he would be.