It sounds like a good argument, but If I was running fast as if to confront a foe and there was a 3 foot gap before me, I would be leaping over the fissure "with a great rush", though I could probably leap across a 6 foot gap. My point is, leaping "with a great rush" does not necessarily mean that the gap was great.
Also, and again, the Balrog may have had great size in shadow and fire, without being too massive to stand on the bridge.
Furthermore, the mathematics are convincing, unless you're talking about a wizard...oh wait...we are.
Just stirring the fire...
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