The "extremist Muslim" has a suicide vest strapped around his body and walks into a street/restaurant/bus/nursery and detonates it with a hand held switch and takes his life along with everyone else.
The "moderate Muslim" leaves the bomb planted in the street/restaurant/bus/nursery and walks a block away, and detonates it from a safe distance with his cell phone.
In other words, the "moderate Muslim" has more "feelings". He doesn't really see the point in killing himself along with everyone else.