Norrin has been board-ruled to be equivalent in speed to the Flash, and IIRC that's the Wally West Flash.
Other than his big "Break into the afterlife via sheer speed" feat (which IIRC was sheer travel speed and required Supes to continually accelerate in a straight line for a significant period of time) PC Supes has generally been depicted as neck-and-neck with the Barry Allen Flash as far as super-speed footraces (that require complex movement and therefore are more indicative of reaction speed) go. (And yes the "Those were for charity, Clark" quote and subsequent easy win is by Barry, but to post-Crisis Supes, so take that as you will.)
Wally > Barry. I'm not sure by how much, but overall that should quite easily put Norrin at a level where he can drain/transmute/etc. PC Superman and therefore Ban-el before either can do any crushing. If Wally >>> Barry, then Norrin can outright blitz PC Supes. If Barry's 'charity' is accpted as him being faster than PC Supes, then Norrin can also outright blitz PC Supes. If both, then it's a supremely casual blitz.
tl:dr; Norrin *fast,* yo.