[ Being that Soubi hadn't had any particular destination today apart from walking with Ritsuka that morning, it isn't strange to find him wandering, especially as he's still trying to familiarize himself with the dome, as he'd just arrived the day before. He hadn't done much looking around indoors, but he discovers more than he bargained for when he comes upon Sebastian.
It says something about Soubi that he notices that word as much as that wound. 'Master,' hm? He doesn't feel obligated to help--not in the least--but given a moment of thought, he has to resign himself. Ritsuka probably wouldn't be pleased if he discovered that he'd simply allowed someone to bleed to death. So there he is, crossing the room to place a steadying hand on Sebastian's shoulder. ]
What do you need?
[ Because that's a far more poignant question than 'are you all right,' since it's obvious he isn't. ]