PC or nothing?

[kbilla]

A1 drives down the lane and slams into B1 who has LGP. B1, however, is considerably larger than A1 and the contact does not budge B1, while A1 goes flying and the loses control of the ball...I come out with a PC foul, but after thinking about it further in an advantage/disadvantage context I am wondering if the correct call there is no call....I have been to several camps where clinicians would say I am sure that if there is that kind of contact you must have a foul, but B1 was not necessarily put at a disadvantage by the contact, and there was no way I could have a block on the play...thoughts?