Just curious as I don't know...but...
...in watching the talking-heads' analysis of the Suh hit that got him fined $100,000, it occurred to me that Sapp's hit on Clifton was similar. Both hits were on interception returns fort TD's and the blocks were made well away from the action with an offensive lineman in pursuit but in reality would never be able to make a play on the ball carrier.
The NFL said Sapp's hit was "legal". What made Suh's hit illegal? because it was below the waist?