Wondering about the interaction between Nick Fury’s Assault suit ability to add damage and the damage from…

Pulse Grenade only deals 1 instance of damage to its chosen target, so any “additional damage” is applied onto this 1 instance. This is what differentiates Pulse Grenade from multi-instance attack abilities; 1 target is chosen 1 time, and a variable amount of damage is dealt at once to that target. For example, if you used Pulse Grenade’s ability and discarded two cards with 2 and 3 boost icons respectively, then also removed 3 threat from Assault suit form, you’d deal a total of 8 damage to the chosen enemy.