We already know how this movie ends. The last thing you want to do as an investor is to put more money into a losing trade. That is exactly what the shorts decided to do today (go figure). That is how bad trades become terrible trades and how terrible trades become trades that blow you up. Best thing to do when you have a bad trade is to either close the trade out or hedge the trade from further downside. You never want to be in a position of adding more money (good money) into a losing trade (bad money).
What movie are you watching? Shorts sold on 5/22 at 165.93. Then they covered on 6/24 @ 157.06. Why would you imagine they were averaging up on their shorts? Shorts don't do that. Pud might be averaging down on his imaginary short ETFs but he's mental.