Any fool with a bomb (excuse me, "sactified martyr") can lay just one IED, pop it, and claim jihad! on us.
But a daisy-chain rig is meant to take out more than one vehicle in a convoy. Damages two or three, block the road and cause confusion, and set up the convoy for a direct fire ambush, RPG's and automatic fire.
This guy meant business. And lighting him up stopped a whole lot of problems down the road.
Thanks for the info. Having to set so many explosives must involve time, time when the individual is exposed. That would, it seems to me, involve passive indifferance by anyone around.