Prophecy misinterpretation?

[Ciji]

No: HPFGUIDX 134693

What I want to know is... how could Snape have heard the beginning of
the prophecy and not the end? Let's review: he was listening at the
door, got caught, then presented to Dumbledore as a snooper. If he got
caught mid-way thru Trelawney's spiel, how did he miss the second
half?   If there was an interruption (as Trelawney put it) in the
interview, did Trelawney continue to give the prophecy after Snape
left?  Of course not, because she saw Snape was there.  So then
wouldn't Snape hear the whole thing if he was listening and caught
right by the door then immediately brought into the room?   It seems
as if it he should have heard the latter half, then get caught.

-ceej