Is it damage that is causing the interrupt or the bash/slam? When do you get the interrupt message?

Bash/slam will not stun an ogre from the front, but you will take damage and it can still interrupt because when mobs hit you they can interrupt.

Here is Haynar on the issue:
Since his post there was a patch note about ogre stun immunity should be better for ogres, but I cannot get any explanation on the patch note and from in game, it seems nothing has changed. Like I said it took me 6 casts the other day to get a Disease Cloud(one of my fastest spells) off on a FG because of melee interrupts.

Yeah, that sounds right. Just regular damage always had a chance of buggering up your casting. Nothing better than getting tapped for 1 mid CH and at the end of the cast getting the interrupt message lol.

Stun immunity =/= OMG Never interrupted.

I know that, but it was the push of the melee attacks that interrupted you, Channeling made it harder to get motion interrupted. Cornering yourself made it almost impossible. Read this part?

My question now, is what did this do:

????

Why do people use that instead of !=? Serious question.

They're aware of the mathematical inequality sign but not the computer programming version.

I believe my memory and experience line up with Girth on this one. I don't remember ever being interrupted from just being damaged. For instance, a DoT tick never interrupted my casting. A non-stun spell, never interrupted my casting. Only melee hits, stun/mez spells, and bash/slams interrupted casting, and the melee hits only did so when they could cause movement. If you were successfully cornered, you limited your interruptions to the second and third categories. If you were also a cornered ogre, it was only the spells that could do it.

I do not have hard evidence on this. It is just my honest recollection atm, but I will try to do some research or perhaps experiment on live.

Most people don't know what != is.

!hard :(