I could be misreading your question, but I believe in your case, the announcers were referring to the defense *of the same team of that offense that was out there for 10 minutes*.
As others have said, playing defense in football is exhausting because you’re constantly having the react at full speed and power.
So, if Team A’s offense is out there for 10 minutes (practically an eternity in football), then at the same time Team A’s defense is resting for a long 10 minutes to catch their breath and get fresh, while Team B’s defense is out there defending for a long 10 minutes, getting exhausted (and probably even more so if Team A’s offense is running the ball…that especially exhausts a defense because it’s usually man vs man physical battles).
Hopefully I answered it and didn’t repeat anyone and/or misunderstand you.
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