Paul breaks the rules
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Paul initially picked up the rice to try and put it in a balloon, before he ate some of the mango to transport the rice to the bottle. He then brought bottle into the lab, where he just picked up the rice and put it in the bottle. He initially received no points, but Greg gave him a bonus point for being gracious in defeat.
(Written by Taskmaster Wiki contributors)