When Sirius goes into the boys dormitory and Ron wakes up, Peter/Scabbers already faked his death and Sirius knows it. so what did he attack the second time for?
here's the timeline:
in POA chapter 12 Wormtail fakes his death:
Harry looked down at the sheet Ron was holding. There was something red on it. Something that looked horribly like- "BLOOD!" Ron yelled into the stunned silence. "HE'S GONE!
We later know that Crookshanks informed Sirius about Scabbers faking his death-
"This cat -- Crookshanks, did you call him? -- told me Peter had left blood on the sheets....
However, in chapter 13, after Peter fakes his death and Black is informed, Sirius breaks into Gryffindor tower:
"PROFESSOR, I WOKE UP, AND SIRIUS BLACK WAS STANDING OVER ME, HOLDING A KNIFE!"
So what did Sirius hope to find there, when he knew perfectly well Peter wasn't there?
More than that, Sirius presents the story not in the chronological order:
"He tried to bring Peter to me, but couldn't... so he stole the passwords into Gryffindor Tower for me.... As I understand it, he took them from a boy's bedside table...." Harry's brain seemed to be sagging under the weight of what he was hearing. It was absurd... and yet... "But Peter got wind of what was going on and ran for it." croaked Black. "This cat -- Crookshanks, did you call him? -- told me Peter had left blood on the sheets.... I supposed he bit himself... Well, faking his own death had worked once."
Is there something I'm missing here?