Mark's correct. In fact, a "moving screen" can even be a legal maneuver: "The screener must be stationary, except when both are moving in the same path and the same direction." [4-39-2c] If contact occurs because the "legal moving screener" slows up or stops, the opponent is responsible. [4-39-6]
Some other important points about screening [4-39]:
- When screening a moving opponent, the screener must allow the opponent time and distance to avoid contact, though no more than two steps.
- When screening a stationary opponent from the front or behind, he can be anywhere short of contact.
- When screening a stationary opponent from behind, he must give the opponent one normal step to avoid contact.
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