Did the lighting main who used sealing slash use any sort of summon mystery like Pakkun or Shiba when interrupting you?

There is one thing I noticed about summon mysteries. Once the main has clicked his mystery he will use his summon mystery before that. The thing is, the time span in where the main does his summon mystery is a point of no return. You can't under any cir*stances interrupt the main's mystery during the time span in which he does the summon mystery. When the enemy activates a mystery during that time span of no return it won't go off till the main has done his mystery. That being said, if your position 1 activates a mystery while the other main is doing his summon mystery, you won't go first but the main will. That can result in the 4th position acupuncturing and interrupting the position 1 character. In your scenario the enemy probably just wanted to do damage against your Kushina but your Kushina mystery was activated by the game during the time span in which the main did his summon mystery, resulting in Kushina being interrupted. I think I know why that is happening. The game doesn't register the summon mystery as an action before the mystery which can be used for reaction time (e.g. Mabui's 40 chakra passive) but instead it counts as part of the actual mystery. That's my theory at least.