Simply put into words, when the player watches a Cinematic Sequence which uses a Cine Camera, if this camera is tilted in any way at the end of the Sequence, the player camera will mimic its rotation after the Sequencer ends.
Adding to this, if the player attempts to respawn to fix their camera, they will respawn invisible as seen in the second half of the clip.
How to replicate: Create a Sequencer where the Cine Camera is rotated in either the X or Y axis, then trigger the Sequence in game and watch the player camera get distorted.