If the enemy is camping with a shield, you can defeat easily by picking up another shield(as a hunter) and melee them in the face
There is a useful thing you can do to have longer bunny hops, slide and jump at the same time(I think it makes the animation in 3rd person look like sliding in air) <--- This confuses enemy sometimes
As Cell, if you find a body of water, hide in the water somewhere(Cell have enough air for 2 minutes now, breathing mask) Plus, you can have a underwater CELL dance party with the animation glitches underwater. (melee hunters underwater of course)