I would let the leader go. I think, as an IC thing, Althaea would be worried about collateral damage should they engage her or give chase.
We could try to incapacitate G2 for questioning, who's supposedly closer and, I'd assume, an easier target. (I'm a little bit suspicious about a random (seemingly pre-planned) ambush, considering that there are probably plenty of other, less well-armed looking people in the city to steal from, if that was their motivation)
In fact, I think I'll do that.
EDIT: Hrm.... with those rolls, I do hope he goes for the intimidate check...