How is "Can we use an array element as a loop iterator for another array?" ambiguous?

Granted, the question itself seems to be fairly clear, but the code presented to do that is so far from that and so buggy that I just can't make sense of what the OP really wants to do (which is the reason I asked for clarifications). Add to that that the C-style loop (that supposedly works) does something completely different that it just obfuscate further the OP's real intent.