I suggested the following:

1- An isolated dark island stage (Beach Stage)where u can see some savage creatures walking around u and the battle area is surrounded by a pool of water where sharks come to settle in. On the FINISH HIM/HER the character does an uppercut on his opponent, he/she will fall into the water where there are sharks waiting for food, so the screaming opponent will be ripped apart until u'll just see a pool of blood.

2- A forest stage where u can get easily lost (Amazone Stage) and where u can see many monster looking trees around u and under the battle area there's a long deep round fall which it's walls are surrounded by spiky trees and at the end there's a very low level of water, so when the screaming character falls he/she will be hurt by these trees (showing cuts and blood) untill he/she touches the ground where the few water will be filled of blood, at this moment he/she won't die but he/she will start moaning without being able to move untill a bunch of crocodiles come to rip him/her apart and each one takes a different part of his/her body.