To add to the confusion:

Many modern gliders are elevator limited - full aft stick just won't
result in enough AOA to stall the wing. Nothing to do with the tail
being stalled. In fact, it's "lifting" just fine, just in the "down"
direction (which could be up if you are at the top of a loop). If the
tail did actually stall, you would get a brisk nose down pitch rate, I
would think! It would be almost the same as the horizontal tail
falling off. Think about it....

Also, the tail on modern gliders do not always push "down". Depends
on speed, AOA, G-load, CG location, flap position, etc. You have to
look at the entire lifting contributions of all the parts of the
glider. Stability is due more to decalage. Look it up.

It's amazing how little most pilots know about how their aircraft
really work....including yours truly!

Kirk
66