Followed by smoke trail, why is this?

[:FI:Rabitski]

I have noticed on the last few patrols I have been on, that after a while I seem to be followed by a column of smoke, it seem to happen after I make a few saves during the patrol. I just wanted to know if this was a bug, has it happened to anyone else, and finally I there a way to stop this from happening.
http://i10.photobucket.com/albums/a124/Rabitski/SH4Img2008-03-03_085743_046.jpg

[Dowly]

WOw, seems someone's not happy you sunk him. :88)

[DrBeast]

Just a bug. I'm seeing that in almost every save I reload, especially if I've been hit (even if all the damage has been repaired).

[Lopo]

I have noticed on the last few patrols I have been on, that after a while I seem to be followed by a column of smoke, it seem to happen after I make a few saves during the patrol. I just wanted to know if this was a bug, has it happened to anyone else, and finally I there a way to stop this from happening.
http://i10.photobucket.com/albums/a124/Rabitski/SH4Img2008-03-03_085743_046.jpg

See post #1446 in http://www.subsim.com/radioroom/showthread.php?p=744590#post744590

Lopo