Yellow Rat Spell - Maybe it really did work

[Steve Binch]

No: HPFGUIDX 50813

I was just thinking about this spell that Ron casts on scabbers:

Sunshine, daisies, buttermellow,
Turn this stupid fat rat yellow.

It obviously didn't work... or did it?

What if yellow means to be afraid instead of the color? We know that
Petigrew was brave enough to stand against Black, but now he seems to be
afraid of everything/everyone? What if this seamingly simple spell cast by
Ron, is the only thing that keeps Petigrew from having the courage to stand
against Voldimort?

Any thought? Insight? Previous discussions?

-Steve