Making sound like it's coming from behind

[Ruriko]

Here's the video clip http://www.mediafire.com/download.php?ga4yeijtcmj
At 0:13 the rockets fly behind the rock and then it crashes. How can I make it sound like the rockets are coming from behind the rock? and you know when it crashes the rocks start falling how can I make it sound like that?

Please note I use Audacity & Adobe Sound Booth

Here's the bomb sound effect http://www.mediafire.com/download.php?vzynijkcuu3
This is the rock slide sound effect http://www.mediafire.com/download.php?oke1nzzgtte
This is the rocket sound effect http://www.mediafire.com/download.php?yhzmmn2iylm
This is the flying rockets sound effect http://www.mediafire.com/download.php?mqijwzm1qlk