Originally Posted by
Count Zero
No one's talking about being unable to mount if they've taken damage, which you implied is the only way this happens; people are talking about a bug, not a known restriction.
And if you have been paying attention you would have noticed they greatly relaxed the penalty on taking damage. Used to be if you took any damage, even fall damage, you would have to remount to water walk. Now fall damage doesn't count at all, and I think even mob damage doesn't count after you've left combat (without needing to remount) (not as certain about that one, but definitely about the fall damage).