Forty things can go wrong banking the one ball straight back. Nothing can go wrong banking the one ball cross corner if you hit it even remotely decent. Plus with a 2-0 lead you will either make the cross corner or leave nothing if you miss, and you might even block the corner pocket, which would even further serve to protect your 2-0 lead.
Beard
Knowing Alex he probably banked the straight back and went forward with the cue ball 3 rails and down to the back rail. Forty things can go wrong doing that also.