Genuinely how is he not dead? The hand went past the colon… and um ew

My dear, there's two things I can say:
1. Only a few organs are really well fixated on a spot so they can be " rearranged if needed.
2. It's a frickin yaoi where a SNAKE turns into a HUMAN and all that just to DUCK A GUY. Ya really want to put logic in that?

I can’t blame them for the logic part, everything about this manwha is so unrealistic but my logic mind is just
HOW??? WHY???