When they bring Jesse Walt dives atop him while simultaneously starting a remote machine gun mounted in his car that kills most of Jack 's men .
Jesse has been chained up in a lab and forced to cook meth since his abduction .
When they bring Jesse , who has been chained up in a lab and forced to cook meth since his abduction , Walt dives atop him while simultaneously starting a remote machine gun mounted in his car that kills most of Jack 's men .