Help with Lupin's boggart / Cockroaches

[pippin_999]

No: HPFGUIDX 97600

Potioncat:
> BTW, in OoP, do readers think he vanished his boggart 
differently  than in PoA or that JKR just used a short-hand to 
describe the  situation?  It seems to me we see a shorted 
version in another  boggart scene too, but I can't place it.<

Lupin doesn't vanquish the boggart in PoA. Neville does. "[...]the 
boggart exploded, burst into a thousand tiny wisps of smoke; 
and was gone." --PoA 7

Unless I'm mistaken, we never find out what happened to the 
other boggart, the one that Harry uses for patronus practice. At 
one point, Lupin uses his wand to force it back into its packing 
case, and despite Lupin's use of riddikulus  it has the form of the 
"silvery orb." --PoA 12

Pippin