At 7:30, Kat can blink onto her dagger location which can clip into walls, if her e position is over half way through the wall then it will push her over automatically (similar to how flashing over a big wall works). ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-c2j5P1CoLUc.html This video explains the mechanics (time linked if you are interested). Kat can blink to daggers before they land and it also extends her e range which can catch enemies by surprise.
Yeah I knew about this I was more so confused about her not picking up the dagger when she did it. But apparently u can jump before the dagger even falls on the ground.