ugh i dont want to get sucked into this but.. metaphors people lol
IMHO:
Balrogs "flying" in the Silm would be the same as the fellowship flying after Gandalf fell: "Fly you fools!".... one of many examples, like, why arent we asking: did Shadowfax have wings?
The parallels of both the LOTR balrog's and Gothmog's demise are curious, but one aspect says it all for me. They both involve: (drumroll)... falling.
thats it - no more poetry