I feel so dumb i just came back to look at the manditaki warrior level and found the second half of the secrets... there's a pool of "health" liquid in the battle ground! I was just jumping around to try and find what the other secret was and there it was under my feet. :mad:
I just found that last night, too (after months of playing). Sheesh. In my case, I decided to go through a couple of the levels just using the V-Blade, to see what I could scare up, and there was that pool. Oh well.