He was fast on live as well. Catching up to druids with SoW on apparently.
http://eqbeastiary.allakhazam.com/search.html?id=3609
Posted by glynicus about 8th post down going from oldest to newst:
"This basalisk has sow so you must snare and root it ideally. He has around 2400 hp. His stone breath, even when resisted, interrupts your spells. I kited him with my 51 druid and he even managed to get a stone breath on me, despite having MR on."
That's all that I could find though. Might not be a bug, but he is supposed to be faster than the average lizard.