(Sppilers).....SERIOU S flaw with the backup fuse !!

I really do love this movie. Some say it is a little long and the middle part "drags" a bit. Maybe so--but AFTER that part--it is nearly NON-STOP action and suspense.

However---I have noticed a VERY serious flaw, in the bomb, regarding the backup fuse. This is a simple time-fuse, pyrotechnic type, that simply burns, once lit, till it reaches the detonation network in the bomb. It is there as a "just in case", the main electrical detonation fails or is compromised--which of course happens.

HOWEVER--there is NO WAY--a REAL terrorist would design a backup fuse that way. Once lit, it gives from 5-7 minutes of time, before it detonates the bomb. Those few minutes end up being the difference between a few hundred people killed by stampeding crowds--or EVERYONE--in and AROUND-- the stadium dying--when the bomb detonated, its huge blast alone killing many thousands of people, and the subsequent barrage of steel darts--to finish off things...

SO WHY did Dern have such a lame backup system? If black September had the ability to get C-4 type stuff, rifle darts and all of the rest of what he needed...SURELY they could have gotten him so Primacord and a VERY SHORT length of time fuse connected to a cap to trigger it.Primacord burns so fast it can't be seen doing so easily. This would have resulted in near INSTANT detonation of the bomb--accomplishing their goal.The several minutes the time fuse gives ONLY makes sense--in the movie world--since it gives the heroes time to save the day !!