What ability is this, and what class uses it?

[Rjain]

So you mean to say the guy jumping through the air pulling Kunai out of nowhere (and in 3's) was a gladiator? I do not believe you...

Those were throwing daggers, which is a gladiator weapon. The weapon by his side is a dagger, which is a gladiator weapon.

Now, one might argue the weapons by their sides don't denote what they are since they're NPCs, but that wouldn't make sense. Why? There's already tons of arcanist/musketeer NPCs with their weapons, so why not give the quest NPCs the proper weapons?