I think theres a whole art form in it that is hardly used these days I see some fighters do it reactionally but maybe not intentionally to set up a hit.

I think to land a cross or straight and lift your arm into a wing so their counter hook cant get around your elbow (bit like hiding behind a wing) is one I see work in reaction quite a bit, but I dont think its taught.

Also in close when its on and its tight; dropping the elbow into their arm while loading it up and launch an uppercut off it in the same move.

Anyone into this as a practice?