Tips for Radobaan?

Bow main here. Got Legiana's Bow at G5 L5 with Focus 4 and Ice Attack 2.

Struggling with beating 6* Radobaan. Most of my time spent just dodging to the side waiting for him to finish his rolling, then by the time I get the shot he's too far away to deal meaningful damage. Should I be hunting him with a different weapon or does he just not give bow users the window needed to attack? 4/5* easier since even the crapshots I do land can break him easily.

Any advice would be nice, though I would assume to learn to perfect dodge better?