The reason I think ten seconds is an entirely reasonable amount is depending on what your frame rate is, which can and does tank even on high end machines under certain circumstances, it's entirely possible that your 4 seconds raise animation could get dragged out to 6 or 7, and then due to latency between client and server, by the time you're "out of range" you were still in range as far as the server cares and that AoE hits you.