https://news.usni.org/2018/03/08/singapore-safety-report-uss-john-s-mccain-aug-21-2017-collision
The safety investigation determined that the USS John S McCain made a sudden turn to Port (left) into the path of Alnic MC because of a series of missteps that took place after propulsion controls were transferred.
When the Bridge team of Alnic MC saw the USS John S McCain turning, it presumed that the USS John S McCain would be able to safely pass ahead. The collision happened within three minutes of the USS John S McCain turning to Port, and the actions taken by Alnic MC were insufficient to avoid the collision.