I always use the POW (mario blocks anyone?) Hoping for gradual SP replacement. This has happened only three times out of too many to count.
What i usually end up with is steady damage.
Not sure if it's because they try and heal me (i am usually undead), or if they actually are just doing random damage, but it frustrates my comrades something fierce when they call on me to nuke and realize i have been POWed to death.
I have yet to get a satchel charge out of one, but would love to. And on that note, i wish we could keep the charges from the cannith quest. Or even buy them/get them as loot drops. How fun would that be?