If you already know how to extract from the other audio files, this will be simple.
(if not,
http://www.bully-board.com/index.php?topic=19710.msg332503)
The files are in the audio folder in bully, just go to xact.
(from google searching about the .sea files)
# for the Bully: Scholarship Edition (PC) '.SEA' files
get XSBOFF long
get XSBLEN long # XWBOFF
get XWBLEN long # EOF
get INITREFS long
get XSBN basename
string XSBN += .xsb
get XWBN basename
string XWBN += .xwb
log XSBN XSBOFF XSBLEN
math XSBLEN += XSBOFF
log XWBN XSBLEN XWBLEN
Save that as xact.bms
Open that with the quickbms
Then pick a .SEA file
Then just convert to .wav
Yes this is working fine, I even found Russell's roar.