Path above cave exit on Thieves Island (spoilers)

I just found my way out of the Slayne traps you in after he betrays you. On the cliffside that the exit is formed into I noticed that there were some platforms to climb up (slightly toward the harbor side of the cliff, away from the exit. I began to climb and after about 4 the path reverses, requiring you to jump back toward the way you came but up to a higher platform. However, I cannot get to this platform, it requires you to run and jump to grab, which I didnt think was possible in the game. Has anyone else noticed this area, and more importantly, has anyone been able to get up here?

thanks for the tip. it is tricky but i got it