I'm watching Briesath's "A Pool Lesson" DVDs and as a myth buster he said that if you have three frozen balls and hit them with left english (for example), that the spin only transfers to the first ball hit. I was taught that each ball would feel the effect (to a smaller and smaller degree of course).
So, is it true that the spin reverses for each subsequent hit, if the balls are not frozen but merely very close together? I sometimes think that way if "if any amount would help" for a particular shot (e.g., a three ball combo is very close to going).