This is a cool percussive riff that closes the song “Fallen Disciples” by Threat Signal. Unlike most riffs, this one focuses on the muting instead of putting the focus the notes. You’ll notice that the actual notes played in this riff alternate between doing downstrokes and upstrokes. This riff is done with alternate picking, so just focus on those alternating up and down pick strokes of the notes, and mute everything in between. That’s the easiest way for me to think about this riff.