This topic or tip may be posted before but just incase I will mention it for anyone who haven't heard or used this tactic before:
Through my experience of the crucible, crouching and slow movements doing so will take you off the radar. I have many enemies run pass me to only get ambushed or confused of my presence.
Note though you will occasionally show up on the enemy radar which is better than staying on it completely. Also, you can see your center dot on the radar disappear when crouching same goes for it reaapearing.
I'm a warlock so this shouldn't be class exclusive.
So crouch and take cover doing so~
Praise The Sun and Save The Whales!
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Sittin takes you completely off, crouching you become a blip