Merc AI/aggresiveness

Hi.

When I first saw the content reveal, i'm hooked by idea of aggresive merc shown by scion + eruptor.

I'm trying to make my merc as main damage dealer. Trying smoulderstrike atm. They prefer to walk and not leap slamming to get closer to enemies before doing molten strike.

How can I make them jump at enemies like in the video?