Block / Charge Situation

[OHBBREF]

I had this discussion in pregame over the weekend and this play was brought up
defender B3 is guarding A3 in the lane - as A1 drives to the basket A3 rolls down the lane line toward the low block B3 remains stationary and maintains his position in the lane sideways (hips and shoulders) toward A1, but having been sationary for several seconds prior to contact initiated by A1 as he drives toward basket?

B3 by rule never establishes "legal guarding position" as he never faced up to the offensive player, however B3 has had a stationary position for several seconds prior to any contatct and does nothing to inititate the contact, are you going to call this a block because of no LGP?