Gravity in combat
1. Random scenario: You are charged by a Mammoth. He smacks you with his tusks. How far do we fly? Will it be the same as getting knocked over by a rat or will you fly a realistic distance. Mammoths are big creatures.
2. Powerful strikes
If your character has super high strength, can you send a similar sized foe flying?
Will spells send foes flying?
Walls/Tables
Say for example, you hit a guy and he goes flying into a wall/tree, does he get extra damage from the wall? They're hard things.