Scratch

I've got a problem with my scripting on a game that I'm working on. In this game the player starts off with 5 lives and when they crash their space shuttle into the walls the shuttle explodes (this consists of a few costume changes for the shuttle sprite) and 1 life is lost... or at least that is the intention. The problem I have is that the explosion sequence happens twice & two lives are lost.

I'm no good with Scratchblocks but I will try to explain the bits of code involved:

To call up the death sequence I have used...

if touching colour (red)?
set "SX" to 0
set "Thrust" to 0
set "Gravity" to 0
broadcast "Die"
stop script

and "Die" broadcast looks like this...

when I receive "Die"
switch to costume "Shuttle2"
wait 0.2 secs
switch to costume "Shuttle3"
wait 0.2 secs
switch to costume "Shuttle4"
wait 0.2 secs
set ghost effect to 50
wait 0.2 secs
hide
switch to costume "Shuttle1"
wai 0.6 secs
change "Lives Left" by -1
if "Lives Left" >1
set "Level" to 1 (sets the player back to the first level)
broadcast "BG" (this is the broadcast that draws the level)
broadcast "Start" (sends you back to the main loop)
else
set "Lives Left" to 0 (not sure if I need this line)
broadcast "Fin" (broadcast the "Game Over" message)

Can anyone help?