I just beat the assassin archer throwing darts that was on a tall pillar while I had to defeat his cronnies. I left there, and made a few flag pole jumps to a checkpoint. I am now standing on a platform trying to jump to another flag pole. there are spikes coming out of the wall, the arrow is telling me I need to go downward and somewhat to my right. I can reach the spikes, but not the flag pole. Am I missing something?