I like the motion sensor idea, but first tell me how the C4 works, exactly.
With the C4 made before (forgot who made it), you held it down for a certain time, and after release, it would detonate in the amount of time you put in.
With this one, you say there will be a motion sensor. Will this be a C4 that is not timed? It is just detonated?
IF so, great idea, I like the motion sensor addition.
IF not, well I'm just confused ;P