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The farther the angle the more angled vector you're putting on the TIP, which can be worse than the 2X of a straight tie on. If ya gotta angle it to make it safe, it's too sketchy to climb IMO although what Nick says is certainly valid.

You "have" to have 2 mechanical points on the rope or 1 prusick of some sorts. I feel pretty confident climbing on a single, closed shell ascender like the CMI Rope Walker. I don't feel confident on a single, open shell ascender like a regular hand ascender.