Kevin was not sure what had gotten into him when he pulled Rei to the back with him. All he knew was that they were all at the limit of their physical abilities and with him unable to fight well, he would only be a burden. This girl was wounded because of protecting him.
If it was only Neo and Mike, they would be able to go into the forest safely. His presence was the only reason why they didn't try to make the attempts to enter the forest. He couldn't move well with his head still in constant pain and dizziness.
His eyes were looking as they all struggled to protect him. To be exact, he was looking at the young girl who was trying to block the bullet out of his range. He was not sure why, but he didn't want to see her get wounded anymore. Without thinking much, he pulled the young girl to the edge of the cliff with him.
At least in the water, he wouldn't have to face the barrage of guns and just have to make sure that he could stay afloat.