Earth Assault Set - Fissure Questions

The way domination works is that most control powers have a second effect that fires off at the same magnitude as the first, but at 150% duration. The net effect of this is to have a double magnitude control for the normal duration and a normal magnitude control for the extra 50% duration. So, for example, earth control's fossilze normally does a mag 3 hold for 17.88 seconds - when under domination you get an extra mag 3 hold that last for 26.82 seconds. As holds stack, this means that you effectively have a mag 6 hold for 17 seconds which drops off to mag 3 for another 9 seconds.

Fissure is one of the odd powers - it has a 33% chance of doing an 11.92 second mag 2 stun to each mob in the area. When domination is up it also has a 33% chance to do an addition 17.88 second mag 1 stun. If both of these effects go off, then you get a mag 3 stun, if only the second one goes off you will only see a mag 1 stun (alternatly, if only the first one goes off you will see just a mag 2 stun).