The picture says if all. 7 bombs, still killed Fett the hard way. Jawa engineer needs to have these bombs on a remote detonator. Basically, they could operate the same as now, but you add a 4th attack...
When are they supposed to detonate? Boba's turn or JE's turn? I encountered something similar earlier in same challenge. Except suddenly they went off and Boba was gone. I'm just getting started with him, and so far I'm uncertain of how his basic attack really works. It definitely shouldn't be resisted.