Normally hesitant to include myself in these kinds of threads, but I think it might be on point in this case. Galahad appeared rattled by an overhand right at the start of the fifth and seemed a little shaky and immediately clinched for a few seconds after that. So, the fact that Galahad got bowled over by an admittedly terrific and flush right hand later on in the round didn't seem like that big of a shock. The warning had already been sent. So, his resistance was in question, but the fact that he seemed completely out of it and was unable to react to the next right hand that Martinez lobbed is an indication that his punch recovery leaves much to be desired. When a fighter fails both of these tests so dramatically, then the term "glass jaw" can certainly be used.