I have on many occasions made this observation. Many times I have fired at a Panzer point blank with a Panther, and even a T34/85 with AP equipped and seen either a riccochet or the round go straight through only to make a nice little foxhole for those poor bastards on the ground...but, IT HAPPENS. Now, the point blank stuff I will never understand and I have given up trying to. Butcher will tell you though, at farther ranges, you can bounce 88mm Tiger rounds off a T34 due to the distance, angle, spot where the round hit, etc.