If you are bowling on freshly oiled lanes, there shouldn't be any "unexpected conditions," at least not if you are paying attention. Any unexpected friction that you find inside your line has to be caused by someone else's bowling ball. It's a very good idea to work on becoming aware of what line each bowler on the pair is using. If you can move in without finding friction that was created by someone else's bowling ball, your lateral moves should continue to work. If, on the other hand, you run into someone else's line, then you need to decide if you can make a much larger than "normal" move to get inside of the other persons line, or if you can "ball down" and try to stay where you are for a while longer.
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