When in doubt empty the magazine. Never share a fox hole with anyone braver than you. Anything you do can get you shot. Including doing nothing. Make it too tough for the enemy to get in and you can't get out.
Mines are equal opportunity weapons.
A Purple Heart just proves that were you smart enough to think of a plan, stupid enough to try it, and lucky enough to survive. Don't ever be the first, don't ever be the last and don't ever volunteer to do anything. Five second fuses only last three seconds. It is generally inadvisable to eject directly over the area you just bombed.