Dietre didn't look as though he were in pain, he only looked scared and confused. Maribel trying to reassure him, worrying about him, made him uncomfortable. She didn't have to do anything for him, he didn't understand why she was being so nice. Wouldn't she rather go back inside her house and sleep? It was so late.
He heard the word 'hospital' and took a step away. "No." His expression was stricken. "...I don't want to go." If he went to the hospital his parents would be called. They'd be so annoyed, he couldn't bear seeing the look on their faces, the one that said he was nothing but trouble. He pressed his hand to his wounds the way Mari showed him, but he apparently had no intention of going anywhere.
"I'll..." He shuffled to the side of the road, away from Mari. "I'll sit here until morning, then...then I'll go inside and take care of...this." He nodded as he spoke, trying to convince himself as well as Mari, and lowered himself to sit on the edge of the sidewalk in front of the girl's house. It was clear he was too scared to even go near his own. He grimaced as he sat, then looked up to the girl's worried face, wanting to reassure her, though his plan would only do the opposite. "It's not so bad. We don't have to wake anyone up. In the morning, I'll take care of it, and they don't have to know..." The idea was absolutely absurd but for some reason it made sense in Dietre's strange logic. He didn't want to bother anyone, didn't want to get in trouble with his parents, and so, sitting there and bleeding away until the morning looked like a good option to him.