I mean this song is dumb as fuck but the quote is misleading.
That last line is the start of a second verses focusing on how you can’t take his granpappy’s gun - it’s not part of a continued threat from the first verse
OP definitely knew this, because the punctuation doesn’t even line up as if it were the end of the verse. This is deliberately misleading, which is weird, because the song is obviously already ridden with shit lines.