I hope this is helpful

Ummmm... If you Want the knife thingy to follow the character you should code this in the knife blueprint: When this is created, Repeat every 0.01 secs, Modify this actor x position to creator(character)'s x position+1, Modify this actor y position to creator: y position. An then you delete the old script that just deletes the knife If it gets out of screen. And add this code to the character: When this is created, Create blueprint knife