Haha, funny thing: This time I tried to play in chrome, got to the lizrd as usual and spammed fire.
got his health down to zero (or below) and then that guy jsut regenerated both health bars.
attacking him further (element doesnt matter) shows damage done animation but health bars dont decrease.
and he keeps doing his water and tongue attacks as usual.
seems like spamming him to death with fire has turned him into an immortal god instead :-D
so sadly I cant tell you if that other thing also happens on chrome.
as I cant get past the lizard anymore :-/