QUOTE(varst @ Sep 10 2013, 13:10)
Treat that as a cumulative counter with a certain chance to pass the double check. My understanding is that if you accumulated 0.5 gift and you've a successful double gift check, then you'll get a gift.
Mm. I get it more or less with the cumulative counter idea.
Like this in first place the double gift can speed up your obtention of a single gift. In this case you pass the double check at the 0.5 threshold.
And if, for example, the monster was opened at the 1'5 gift threshold, you would get 3 gifts if the double gift check was passed. The rounding up or down can happen in these conditions too.
I think Derpy time has already ended today.