From the episode

Marvin Harrison Left the field Tonight I don't think You had that in there So he heard today He apparently Tweaked his back In an 11 on 11 drill

STACKED’s take

Negative signalInjury

Harrison tweaked back in 11-on-11 drill during camp.

Arizona wide receiver left the field and tweaked his back during an 11-on-11 drill in training camp; source notes he had gotten off to a good start in camp prior to the injury.

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