Pressing "E" will make your character roll forward. The direction of your roll can be manipulated by turning your camera before and during your roll.
Pressing "Q" will make your character stomp. Ten stomps will kill an enemy player. Stomping on an enemy's head and crushing it will instantly kill them.
Falling from a tall height won't deal any damage to your player but will ragdoll you for a few seconds, making you an easy target for nearby enemies.