Hey OP,
Here's some tips that might help you. I live in the U.S. and my lag leaves me with about 1.5 seconds to avoid Eruption and other moves.
-Watch the chat log closely. You can see him ready Eruption before it appears on the ground. You can start running back, and that extra time will help a lot.
-Radiant Plume affects an area slightly larger than it appears. Make sure you're beyond the edge of it.
-Keep running even after you think you're out; you probably aren't considered out yet.
More to come...