The scary thing about reverse blocks is that descents are optional, ascents are mandatory. No problem thumbing a dive on the way down, but with a reverse block you may just have to injure yourself to survive the dive.
I remember this happening to me once with my sinuses. Had a bit of a cold, was able to eventually equalize on the way down, but then couldn't clear on the way up. I surfaced with high pressure trapped in my maxillary sinuses, which was extremely painful. Finally equalized when I was on the dive boat with an explosion of blood and snot into my mask. Gotta say, that felt incredibly good when it happened...!
I remember this happening to me once with my sinuses. Had a bit of a cold, was able to eventually equalize on the way down, but then couldn't clear on the way up. I surfaced with high pressure trapped in my maxillary sinuses, which was extremely painful. Finally equalized when I was on the dive boat with an explosion of blood and snot into my mask. Gotta say, that felt incredibly good when it happened...!