REVISION
Well, boys, it looks like I goofed, again. I failed to match the down description from the other rule set discussion. So, let's try this twist:
4/10, A-30, 5:00 (2), A=7, B=7.
A11's legal punt lands at the B-40 and bounces to the B-30 where A88 muffs an attempt to recover the ball. B99 then successfully recovers the ball while upright and advances to the 50, where he fumbles the ball, and A66 recovers the ball while 'grounded.' During B99's run, the Head Line Judge, back-pedal fading toward A's goal line in the restricted area, runs into a Team B coach.
Ruling:
(Yea! The format features and emojis are back! Great work, Grant.)