They certainly looked gassed to me too, but I don't think it was because they were on the field too long against the Rams the second half. It may have been the short week plus it just being the second game.
And maybe from playing so much man coverage in the first half. In man, they're constantly sprinting with receiver (the corners at least).
I'm hoping it was the short week more than anything and the trip to the west coast both shortening their time to recover and game plan. At least this week, there are no excuses on defense. We play man coverage so much better than the zone that if those two contributing factors last week left them gassed, they're gone this week since we stayed out west.