Nice crit. Too bad its a minion
For First Aid use of the Healing skill you are mainly allowing the ally to use a second wind without spending an action to do so. So if you used it on your self your would just spend the action to use a second wind. I believe Sk4mpE used your second wind when he posted for you recently to keep you alive.
If anyone has any secret healing now would be the time to whip it out to save the cleric who will fall at the beginning of his next turn from the ongoing poison damage. Temp hitpoints....anything.