This answer to this question doesn't seem to seriously address what's being asked, and looks to me like the responder is making a joke (aka a glorified comment). While I don't know much about the finer details of the LOTR series, I can't find myself believing most of what they said, and the comments seem to agree. As of this writing, it has four upvotes, so I was wondering if there was something I'm missing as far as the content or quality of this answer. If not for the positive votes, I'd probably flag it.
Q. Is it an answer?
Is it a good answer?
Why is it a bad answer?
Because it's a bunch of unsourced assumptions, that's why;
which is no longer able to maintain the cohesion necessary to project his 'Eye-Form' into our dimension
it is assumed he fell the remaining 1.5k (5,000ft) to his death.
"Assumed" by who?
This was caused from the rapid release and detonation of the volatile and flammable chemicals being used to maintain the eye-flame,
stemming from failure of an O-ring on the anti-backflash device on one or both of the nozzles in the 'horns' of the tower used to create the effect.