Declarer does not accept the lead and requires the defender's partner to lead the suit his partner led out of turn.
Law 50D, 2. d) states
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* If the player is unable to lead as required, see Law 59.
I'm sure everyone knows the answer to this one, but the wording seems ambiguous. Clearly if the lead of the suit is prohibited, a defender cannot cash a side-suit and switch back to the wrongly led suit. But what if the lead of the wrongly led suit is REQUIRED by declarer, and the defender cashes the Ace of that suit? Is he required to continue with another round, or can he switch?
Basically, does the "for as long as he retains the lead" apply to both parts of the sentence, or only the second part?