Knockdown Trigger Combo

Thanks to @Ahtano. His tutorial is here....
• Horizon's Grapple Stri...
1. Make sure spear is charged
2. Machine should be in Knockdown, Shocked State, or Rope Hold-down.
3. Halfmoon slash. Don't be too close to the machine, or else you'll do a critical strike instead of halfmoon slash.
4. Hold R2 immediately after halfmoon slash to go into jump off
5. Hit Resonator while in the air
6. While still in the air, immediately hit X to grapple after firing to hit resonator. Do this fast or you'll lose the time window to grapple.

[@Elkyri]

Nice!