Would you call a foul?

[Paul LeBoutillier]

Hey Everyone, I have one for your collective input:

One of the things we've learned about illegal screens is that contact is a must. However, in the Points of Emphasis under Screening it says:

#2. "When a screen is blind, or a rear screen, it is only legal when the screened player is allowed a normal step backward."

Okay, so you're watching as A2 sets a blind screen BEHIND B2. He scoots SO close that there's NO WAY B2 could take ANY kind of a step backward without causing contact, but B1 steps FORWARD and avoids contact with A2.

Here's my question. Since the description above in the PoE suggests that this close-proximity screen is ILLEGAL, do you call the foul WITHOUT contact?