Im sure the issue with hazards and turns is a bug. One turn in live mode is still supposed to be a second or two, evident with the heal spell which ticks quite slowly.
Yet standing in a hazard can almost insta gib you with half a dozen ticks. I think some of it may be stacking - standing in both steam, a firey patch, and actually being on fire and burning. That equates to three ticks of burning damage per turn.
Whatever the cause, sometimes its fine and not a big deal. You take a bit of damage. Sometimes you step on a firespot and you are dead.