If the leaves are more than 50% destroyed I'd probably pull them; less and I'd probably cut off the dead parts of the leaf and try and leave the healthy part. I know sickly leaves invite mold, fungus, etc so I worry about it but I tend to lean towards the paranoia. The dead cola I'd chop and dump. I agree with UGU that the stress level is probably way up so I'd make sure it's on the rebound first.