foul from behind

[Nevadaref]

Nope, you did fine.

LGP is not required for all situations.

Remember that each player is entitled to any spot on the floor provided that he gets there first and without illegally contacting an opponent to do so.

Your presented situation appears to most closely resemble a screening situation in which both players are moving in the same path and direction. In that case, the player in the rear is responsible for the contact if the player in front slows up or stops.

Since, in your situation, the player in the back had the ball, this became a player control foul.