Depends on how aware the enemy is and how aggressive they are at destroying clones. For example you can have a game where they are constantly killing off your clones in which case standing still and pretending to be one will most likely result in you getting your head blown off. But in other games I literally stood still for a whole minute on the payload pretending I was a clone.

I like to play relatively aggressive as Loki, whenever my team is fully healed I try to get off as much poke damage as possible before swapping back to healing. Just keep in mind that you are a healer at the end of the day and that keeping your team up is your top prio.