this one took me ages to figure out cuz in the video he has his guitar dropped down a 1/2 step..
it goes
Bm7 A C#m7
Trouble comes knocking I'll be ready alright
Bm7 Bm7
with my fists up ready to fight
A E D
But i ain't gotta put my fists up everytime
the Bm7 is hammered on from a barred 2nd fret..
the E is played open and the D is played barred...
just repeat that riff throughout.. 