The scoring condition for M04-Rain is that, at the end of the match, the referee can see that at least one Rain came "out of the Rain Cloud".
There is no requirement written about how to operate the Rain Cloud model, so by GP2:
If a detail isn’t mentioned, then it doesn’t
Just be sure that the Robot doesn't break the Rain Cloud (R17) to get the Rain.
Virginia-DC FLL Referee Advisor
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