"Blast! Dailynn Fire now, 3'o'clock, shoulder level, shoot him!" Joss notices that his tactical advice is useless as Dailynn doesn't actually have a blaster...
So instead Joss turns briefly to rally his companions with a shout, and runs out so that he can get a shot at the Gand setting the grenade.
Spoiler: rolls
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So, was going to use Reactionary Attack, but nobody with line of sight/line of effect has a blaster but me...

So, using Born Leader to grant the three of you a +1 insight bonus on attack rolls (as Joss continues to rattle off tactical advice and numbers and such) and then running up and left to get the guy in the middle out from behind cover, but to put myself behind cover from the top one. Thats 3 [up] and 1 [diagonal (up, left)] before firing at the Gand (is this the one setting the grenade? If so, great, if not, oh well)
Attack roll! (1d20+4)[7]
Damage roll! (3d8+1)[21]