let's take deathstroke vs. flash in "identity crisis".
now wally is a guy who at his fastest is clocked many thousands times the speed of light. (and i'm lowballing here). he's done shit like evacuate 1/4 million people from a city that was being destroyed by a nuke as it was going off, have two separate fights on two opposite sides of the planet in two different costumes at the same time and no one behind able to tell he was doing it, and saving the entire justice league from a series well placed time bombs so fast that even superman who can go FTL couldn't see him doing it.
now slade had no feats up before or after that fight to show that he had the necessary speed, reaction time, or reflexes to even comprehend that wally was doing anything to him and yet he tagged him like it was nothing.