Having a hard time beating Tenallo the Thornmarsh pitmaster???
You can plant bombs in the pit before you fight.
Unfortunately you can't plant bombs for the fight against the enduring.
To beat the enduring you need to hit the enduring enough times with your spear to activate the blue target and hit it with an arrow at least 2 or 3 times, once the enduring is dazed go in for the critical strike.