Here's an instance where I'm guessing players ran into each other on a running play because there's no missed tackle, no blinking dots, and that WR can't block both of them.
http://goallineblitz.com/game/replay.pl?game_id=1522417&pbp_id=7709567
http://goallineblitz.com/game/replay.pl?game_id=1522417&pbp_id=7709567