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I charged my Spearmen into a unit's front and knights into a its flank, won the combat, they FBIGO'ed 6" and lost base contact to my knights.
My knights were on the way of the Spearmen so the Spearmen restrained, to avoid a traffic chaos and to face another enemy unit. My knights pursued, but had to turn and were now fighting alone to the opponent's front. In the subsequent turn my opponent charged another unit to my knight's flank and beat them badly.
Something like this would never have happened in earlier editions. My knights would have pursued and killed the enemy unit, or if the unit passed its modified leadership, my knights would have kept the flank. The FBIGO was a huge tactical boost to my opponent.
Hugely annoying. Sure my opponent needed to roll very high for distance of the FBIGO, but when this happens, the tactical situation changes big time.
-Zyg