Spinning Throw, Aerial Twist!
Two skills in quick succession. Dancing Rain's health dropped in chunks like an elevator going down. However, the combo counter was only two.
For combos, Grapplers were in an even worse situation than spell-based classes like Elementalists, Witches, and Spellblades. This was because of how grab skills worked. Other classes could rely on their experience and instinct to find a way to break out of a combo. But since Grappler grabs could not broken out of, if Grapplers could combo, then there would be no counter play.
Long combos were very difficult to pull off with spell-based classes like Elementalists and Witches. However, long combos were impossible for Grapplers. Let alone against a pro player, Grappler combos were extremely limited even against a motionless sandbag.