If you have ever seen a sword duel, 4 on 1. Then the 1 looks spectacular. Also when kaladin rushed in and distracted them, the book says Adolin went for the offensive and was a blur of sweeps and jabs. So just think of a random guy drop kick one of the duelers, its an extremely funny picture in my head, then his disadvantage is only 3 on 1. Either way, Adolin even surviving that long with 4 people attacking him, he must have been a sight to behold.