The guy at the bottom of the screen is running a curl, so not really sure why no safety help matters. I don't know what to tell you, I guess we just disagree.
This is the play, Key is up top and Hunter is down below. I don't think Hunter is the primary read, I don't think throwing over the top to him because of the safeties coming down makes sense when he runs a curl, I don't think
throwing the curl makes sense because it is undercut as he makes his break. The play set up well for Key to just run away from his guy over the top of Hunter (and I assume that was the primary read), but he fell down.
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Any throw just to try and draw a flag risks 1) being intercepted and a flag not thrown, they were letting the DBs play for the most part, or 2) being called intentional grounding because no receiver was close. The ball does not need to be thrown for the refs to call defensive holding or illegal contact (only PI), so if they didn't throw the flag as the play happened it's unlikely they would have if he did get a pass off. In hindsight outcome #2 would be better than what did happen, but I do not know what to tell you if you look at this and say "just throw it!"
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This isn't Madden or NCAA 25 where if you throw the ball early enough before their break the receiver magically changes their route - Hunter is not running a go, he's getting deep enough to make sure the DB sticks with him and then sitting down for Key to run by.
EDIT: I will admit the route is drawn poorly and in the second screenshot here it looks like Key breaks way in front of where Hunter will end up. But if you watch the play he's just trying to out leverage the DBs, he works back upfield before getting knocked down.