Before they changed the rule a few years ago to make it illegal to throw more than 1 forward pass during a down it would have been possible for:
A12 to throw a forward pass beyond the LOS to A20;
A20 could then throw a backward pass to A40 who was behind the LOS;
A40 could then throw a forward pass 30 yards beyond the LOS to A80.
This was all legal as long as each forward pass was thrown from behind the LOS.
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