How about after the bomb is set, 1 person and only 1 can defuse the bomb at a time by getting real close to it (say 200m) and must be stopped completely so it will be vulnerable to attacks. It will then takes 20 seconds to defuse or the bomb will go off in 40 seconds after it was being set. There will also be a timer on top of the screen indicate how much time is left till the bomb explode. I got this idea from CS and AVA…