Actually the potency will be fine, Sativa plants are ment to be cut short for the uplifting high... and if its Indica... he will have a more uplifting high(head high)which feels like sativa he wont get the true indica couch lock... wont be as much cystal or thc but he will still get high... if it were eny earilier it would be ass, but its a week off so it will still be decent, i dont advise it but he can do what he wants.

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So if you're a fighter
and scrappin' a lot,
You'd best shy away
if you're scrappin' a Scot.
Wi' one fuckin' blow
yer head will be squished,
Then he'll let his scottie dog
lick the blood from his fist...