NTSB investigation launched.
Comparison of (A) presumably intended ground track (as taken by many of the preceding 4L departures) and (B) actual ground track:
(A) follows ring taxiway Bravo; as Bravo starts to curve round to the northeast, takes the 3rd right exit and crosses the runway ahead
(B) follows ring taxiway Bravo; as Bravo starts to curve round to the northeast, takes the 4th right exit and crosses the runway ahead
A:
B:
