Juany118
Senior Master
Yeah, a sloppy haymaker can wrap around and tickle your off button at the base of your skull. Not fun. I'd rather cover that puppy up just in case.
Everything is a compromise. Against a telegraphed haymaker, I like the two-handed shoulder stop, since the followups are many. However, you don't always get that amount of notice. So grabbing the back of the head it is for my back-up. Easy to do, provides a good amount of safety. I'm not saying that other things aren't good too. But that's my go-to when things get hairy.
First let me explain better what I meant by the ear being as far back as we go. I mean that is where the palm will be. So the finger tips may wrap a bit around the back of the skull but the fingertips alone really don't provide much in the way of protection, they essentially just become a pivot point if needed.
That out of the way, if you are facing the opponent, unless they are "Mr. Fantastic" from the Fantastic 4 you can still stop the strike you are referring to with the cover hand stopping around the ear though. All that is required is expanding the angle. By this I mean the following; picture the "base" on the angle running along the side of your head and the other portion of the angle starting where you hand is positioned along that first line. Next, with your hand as the pivot point, swing the elbow out as the strike is coming in. Essentially the haymaker slides long the arm, widening it's arc and so it still misses.
This is of course only if you insist on staying in one place. The more sensible course is to simply t-step or release step away from that haymaker, in that case you get the same effect without creating a larger opening for a straight shot to come into through the now wider gap.
Like you said though. everything is a compromise. In the first example I better have my opposite hand in a position to cover what is now a wider gap for the opponents other hand. In the second example I better not dawdle and reorient towards my opponent quickly because I have basically given him a flanking position.
I just try to personally avoid 2 armed defenses against everything but strong kicks because, first I wish to counter as quickly as possible and lastly, if the opponent is any good at trapping, you have placed yourself in a position where they can potentially trap not one but both your arms by simply moving in on the arm closest to them.