Hello,
look at the video: https://www.youtube.com/watch?v=0GR-HYbLz0k
My friend uses steal and trigger interrupt while i wasn’t using any interruptable skill.
The video is in slow motion and you can see a frame before interrupt that the sword hand (right one) was moving for auto attack that is uninterruptible.
It happens quite often, but randomically.
It is easy to catch with a thief because pulmunary impact.