There are a lot of ways to interpret the situation you've thrown out, so you may want to clarify with some specfics.
"Offense pass interference by a Team A player beyond the neutral zone during a legal forward pass play in which forward pass crosses the neutral zone is contact that interferes with a Team B eligible player."
In other words, a Team A player can't block downfield on a pass that crosses the neutral zone.
As far as launching, you cannot target/leading with the crown of the helmet or target and initiate contact to the head or neck area of a defenseless opponent with the helmet, forearm, elbow or shoulder. It is possible that, depending upon the play, the Team B player may be defenseless.