Volo's Guide to Monsters p. 119 lists Bugbears as a playable race, with the Surprise Attack trait:
If you surprise a creature and hit it with an attack on your first turn in combat, the attack deals an extra 2d6 damage to it. You can use this trait only once per combat.
Aren't both emphasized clauses redundant? Is it possible to have multiple "first turns in combat" on a single combat, such that the final clause would be necessary?