Heavy all the way. R2 only. And with good timing u can get 4 r2s. I just did crota about an hour ago as swordbearer. 2 1/2 swords. U just need perfect timing. Hunter carrying the sword is single best class btw. Bladedancer is just plain nuts for bearing the sword. I'll share my pro tip to. Invisible. Stand next to crota soon as u see his shield is about to drop start attacking. Hit 4 r2s. Immediately drop the sword and blink strike crota to turn invisible. Grab sword and wait for his shield to drop and hit 3 more r2s. Your welcome.