That makes more sense, everyone's making it out to be literal slow motion, I'm like dude, they do that for us, the reader/viewer. The sh t happens in real time, the dojutsu users can just react that fastWell you know how when Sasuke activated his 3rd tomoe he seen Naruto in an almost slow-mo type of view!?..
The Byaku's X-ray vision is somewhat of the same but without the mirror effect because as you know x-ray give you the ability to pears through ones body/objects, being able to see muscle movement & change in any sudden movement as far as trajectory so it's a precog type of deal..
(It's as though it's a slow-mo effect but it really isn't a slow-mo it's along the line of advance sensing an awareness)
Insight!..