I was sitting there in maths and the teacher was being her usual twattish self. I suddenly so badly wanted one @ven1x's sniper rifles so I could take a chunk out of my teacher's shoulder. But then I thought "But it'd kill me 'cause there isn't such thing as wall and the BOMB would destry the gun". This led me onto a new idea about how BOMB could work. How about if you had to activate it before it becomes destructive? So, you have to spark it or something.
you could possibly make it so the BOMB has a 1-5 second delay before activation, and make the "timer" the standard glow for BOMB be reduced and then when the BOMB is activated the BOMB starts to get brighter to the point it is now.