The bubble screen is a staple of the spread 'n' shred. It's tough to defend without committing a player that would otherwise be in the box to the slot receiver, and if you've got the right zippy dwarf running it it can break big.
Theoretically, it should be an easy throw, but it requires precise timing and location. If you're off by a couple feet on a longer ball you might take the receiver off his feet but you've still picked up eight, ten, fifteen yards. If you're errant on the bubble screen you'll slow the receiver and wreck the play. Or you could, like, throw it backwards and provide a free turnover to an opponent.
Since that last horrible example has actually occurred this year, this will be no surprise: Michigan's quarterbacks have been pretty iffy on them all year. However, Nick Sheridan had a couple beauties against Minnesota. Here's the purtiest:
Minnesota lines up in a 3-4 with a linebacker or safety sort lined up over Clemons. The outside coverage is offering eight-yard cushions; this is a pre-snap setup that looks perfect for the bubble. (It's markedly different than Illinois' approach.) Especially when…
…the guy covering the slot blitzes. Michigan gives the dive fake, then Sheridan pulls up for the bubble. Note the position of Clemons at the moment. He's four yards behind the line of scrimmage. He will give another yards as he searches for depth, then run forward to a designated spot.
Here Clemons has acquired the ball. You can see the setup downfield, with the outside receivers blocking the two defenders and a safety attempting to close it down from the outside. The key here is the timing of the pass and its location: Clemons catches this in stride, facing downfield. There is no delay between the catch and run. This has not frequently been the case this year.
Excellent blocks from the two receivers and a not-quite-quick-enough reaction from the safety provide…
…a first down. Clemons will use his momentum to get ten more.
Here's the video:
Here's a similar play against a defense that's basically the same except the opposition defensive backs are offering less cushion:
In UFR I said this one "isn't as upfield as it should be," and you see Odoms has to turn his body upfield a bit to catch a ball slightly behind him. I think I overstated my criticism a little bit on review (review-review, actually); this one also sees Odoms catch the ball basically in stride.
A couple notes:
- I can't find where I read this, but IIRC when you see Michigan give a handoff fake before the bubble screen, that's a read. When it's a presnap call they just throw it.
- I'm not sure if different defensive alignments call for different sorts of throws and may be partly responsible for the QBs not throwing these "right" much of the year. But I kind of doubt it; even this well-timed bubble is caught four yards behind the LOS.
- This is the kind of thing I thought we would be surprised we missed without Henne. (We all knew we'd miss, say, laser post passes to Adrian Arrington.)