Thibaud de la Touanne
During the Enemy Phase, especially the Enemy Reinforcement Step, when a enemy unit enters by a tile containing a visible commando, can we use our +1 action token to shoot before the reaction fire ?
[EDIT] Sorry, I misunderstood your message (because you said "reaction fire" and there is no reaction fire in this case because this is the enemy who moves, reaction fire occures anytime when a visible commando leaves or moves onto a tile containing enemy units). If an enemy enters your tile and you are visible, you can use your "+1 Action token" to shoot him before the enemy shooting step.
The +1 action can be performed in the same conditions as an action costing 0 but between the enemy steps only, not during. In the case above, we're still during the 1st phase of the enemy phase so I would say no but I'm not sure of the timing.
In the same case, does the enemy unit shoot immediately as written so during the Enemy Reinforcement Step or during the Enemy Shooting Step (so it could allow the +1 action token to shoot between 2 steps) ?
Then the enemy units will simply shoot during their shooting step. Thre is still no reaction fire as long as you do not leave the tile being visible.