He looked at it again before looking back at how she positioned her stance with the 'I'm not showing you anymore' body language and he had to step back putting his hand on his face thinking to himself how he is going to get past this case.
Whether it was the alcohol or whatever else, the thing he did next was out of emergency but also from his lack of patience with her hiding how bad this thing really was. Stepping back he opened all the drawers looking for what he wanted until finally he found what he was looking for. Before he let her even protest or ask what he was rushing to get, he came back and flicked the blade open of a switchblade.
He didn't even ask to move her hand. He didn't care anymore about courtesy. He moved her hand forcefully out of the way, grabbed the blood stained shirt and cut right up the middle.