The best part
The bad guys never know if its a Frag or a DD as you can't tell by looking at the grenade..
in every case the guys in the room start scrambling for cover..
If your entries are well drilled and your team enters right along with the dd .. you will catch them as they scramble.
It really works.
CAPS Range Officer
Toronto Downtown Age Verifier
If the tongue could cut as the sword does, the dead would be infinite