Deceitful God instant slam bug

During the boss kill event, quest version of Tear Innocence (Deceitful God) did his slam with no cast time resulting in an unfortunate death. Submitting as a bug report with the video since the cast was <.3 seconds from his voice line despite being chilled

https://youtu.be/KZ092lq_xco?si=TjZ43gKX94Y9IBH-