Shapiro *always* does the "adjust the kneepads and singlet" strategy in all his matches, all the time. I've seen enough of his matches to realize this. Here's Shapiro a couple of weeks ago, 1:30 into a match against Sacred Heart, doing just that (pretty sure he wasn't already gassed).
So he gassed in a match against Bryce Andonian, in which he gets an early escape in the second period, avoids stalling and giving up a takedown and gets a late second period takedown and rides out, then gets a TD a minute into the third period, gets 2NF, and rides out the rest of the period? Sounds legit.
The ref gave the concussion signal in Shapiro's second *loss*. About a minute in, but hey, he was gassing.