Prank

[sylviablundell2001]

No: HPFGUIDX 80119

Oh come on! A sixteen year old boy wouldnt realize that the nasty 
jape he was engaged in might actually kill Snape!!  What sort of an 
idiot was he!Sirius knew perfectly well that his "prank" might 
involve the death of either Snape or Lupin, he just didn't care, so 
long as he got a laugh out of it.
I agree that DD had a duty to protect Lupin and so would not want to 
bring the whole nasty matter out into the open, but he still seems to 
have taken a rather light-hearted "boys will be boys" attitude. You 
don't hear of any repercussions from Snape's parents.Probably he 
didn't tell them, given what we later see of them.Must admit your 
take on Sirius' mother's reaction had me giggling.
Sylvia (who is English, has tried saying "prank" with an ironic 
British inflection, and still doesn't like it)