Not sure how you think lead has a "similar view". Lead watching this play will see nothing on a trap. Will be most likely straightlined and have no angles... That being said...
Think about the distances on a basketball court
If trail is standing at middle of court. That is 25' from either sideline. If ball is 3 ft from half court it is 39" from the base line (84 ft floor) but based on simple math is less than 26' from trail... For lead to referee this play and get the same distance you would have to step up to top of highest lane space.
On a 94' floor the distance is still the same for trail (less than 26ft if standing just a mid court) for lead to have same distance 26 ft to the 44 ft line from the baseline you would have to step up to the FT Line to get same distance to make call...
The reason FT Line extended is the division between primaries is that the FT line extended is about the mathematical break even point. If trail steps just 6' to opposite side line (two-three steps) he is just over 19ft from any play in that area.
The notion that "trail's sideline" is some how left open makes liitle sense. If it is a skip pass, trail is watching the ball most likely anyway. If it works its way over, trail works way over.
If for some strange reason it gets dumped into a low post and ricochets off a player to the far sideline I am sure lead can help out since lead most likely saw it...No difference than trail helping out on a ball going OOB on lead's sideline when lead goes strong side....
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