well 10 weeks doesnt mean anything except a guidline.
you can only tell when to harvest by the trichomes. your plant could have wanted to go for a few more weeks and was picked to early.
How to know when to harvest.
check that out.
also if he decided he dont want it make some cannabutter. then make brownies and cookies and all that good shit. those should put a smile on his face. hahah
Cannabutter In 7 Easy Steps!