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Okay, so do I have to call gobbo and start over? :D

No need to start over. 2 (roll) + 2 (grub) = 4 (FAIL)

A total of 5 or better is needed to win, so you lose a life point and have 2 left for this stage. Try again -- thanks to the grub, any roll of 3 or better will pass.

!l2

You still have 2 life points:

!onearrow

You quickly draw an arrow and shoot:
arrow
Holy Cow! This time it actually flew straight and you pierce the enemey for a hit of 5 points!

Whew! Made it!