What kind of permanent damage you thinking? Like a really nasty scar or more along the lines of blindness? If not a loss of limb...
I mean Drago could easily throw her backwards into that outcropping of rocks or fling her into the water. But I don't think they'll be getting back on that bewilderbeast's head in any case. This fight is probably going to end up taking place on the beach though it's currently hard to predict.