Who is responsible ?

[bossref]

2 person mechanics
8 seconds remaining score 53-50
after a timeout after a made basket
new offense down by 3
defense has just 5 team fouls

partner and I discuss responsibility for last shot
we did not discuss fouling

Defense in full court press
Offense has players spread from baseline to baseline

Inbounds pass in backcourt near midcourt
Defense reaches around and hacks in backcourt
nearest to midcourt line on Trail's side

Veteran lead official made call from near baseline and explained to rookie trail (who was still near spot of throw-in) that he should have "anticipated" better
and moved closer to make the call.

Who should be most responsible for this foul call?