The trolls are already withdrawing, before the catapults have time to re-aim and fire, so he doesn't manage to actually catch any of them, but it certainly does a good job of forcing their movement. About fifteen minutes pass, as the fires begin to spread, and the trolls continue to mill around, some of them looking eager to attack, but held back by their leader. Finally, the thunderous pounding of feet begins, as the trolls begin to charge forward, formed into a surprisingly tight wedge formation, clearly intending to crash directly into, and through, his line, putting pressure on a single spot, in order to break through, and out.