just fully discharge it by plugging some 12v automotive bulbs into it,(like the deans discharger) and lay it in the drive way or do what i do and stick it in the grill! just make sure no one plans on firing up the grill!
, if its just puffed and not punctured it isn't totaly deadly especially if it is fully discharged,if you do soak it in saltwater it has to sit in there for days
and packs usually puff when you discharge them to quickly or to a very low voltage
for future reference