Due to the current way echoes are implemented, it is possible to fish for a more favorable objective with no consequences by repeatedly zoning in and portaling out.
For example:
- Choose an echo, Start
- When the area loads, look at the objective. If you don’t like it, portal out.
- Check your echo map - the reward has not been lost for the echo you just left.
- Starting the echo again rolls a new objective.
- Repeat until you get an objective that you favor.
This can be done very rapidly and used to avoid any type of objective the player does not like. I haven’t done super in depth testing on this, but I did note that this still works even after killing one of the Patrol Kill Targets in an echo and portaling out.