system
Given the following post, respond as if you're commenting on Reddit:
human
[LotR] At Helm's Deep, why didn't the orcs just bomb the front gate? Why did they need a special torch bearer to blow up the bomb anyways?
gpt
The front gate is up a narrow ramp, which was in range of most of the archers on the walls. Any bomber or torch bearer would easily have been stricken down.

As for why they needed a torch bearer, they could not have the ignition device and the bomb together or risk uniting them too soon and the bomb only damaging their own army.