This case is from a regional tournament.
N-S pair uses Precision system, strong 1
-------------- J
-------------- QJ75
-------------- AK2
-------------- KQ875
AQ975------------------ 1043
32---------------------- 1098
10873------------------- QJ9654
A3---------------------- void
-------------- K86
-------------- AK64
-------------- void
-------------- J109642
the bidding went like:
------N-----------S
-----------------2 (1)
-----2 (2)----2
-----3 (3)----4
-----5 (4)----Pass
(1) 6+ or 5+ and a major, 11-15HCP
(2) ask
(3) fit, Splinter
(4) BIT

After a long stop in N-E side, the tray was pulled back with 5 on it and then South passed quickly.
West called the director and stated the BIT. Everyone agreed the fact.
West believed that the BIT suggested length in but 5 should be a cue bid. North may hold Kx or Ax in and long s. They had set up the fit.

Obviously, 5 will go down by leading A then swtiching A and a ruff is not very difficult after the dummy is laid down.

So do you think passing 5 is a logical action? The BIT suggested South's pass?

The director let the result stand and 5 by South made.

Experts are better at bridge than less capable players for a variety of reasons. But one factor is as important as the rest, and often more important.