I really think that Fire Curtain is much better. Strike is pretty strong and isn't a bad option, but Fire Curtain is easily the fastest training and only starts to slow down when Meteo comes in and replaces it.
Spoiler
That guy is getting 6.5m exp per hour, which is just insane for misting. Sure, you wouldn't be able to get there without a teleport rock/family teleport, but even the blue monks could be trained at normally starting at 101 (right?), and would still give 3.7m exp (assuming you kill at the same rate), and would burn almost no pots.