Arcs appear as a very steep rise and the upward momentum is impossible to sustain indefinitely. Sometimes an ARC is easier to see on a weekly or monthly chart and curves a bit like an inverted C. First target is often the 50% mark. The average fall is between 62 to 79% or the .618 to .786 fib levels, but can fall less or more than this. Usually there will be upswings on the way down.
An ARC is volatile on the way down because sentiment can be bullish for quite some time. Panic selling often ensues when people realize what is happening after looking down to the earth and realizing a stock can not go to heaven.
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An ARC curves like a "backward" C is a better description of an ARC than an inverted C (O;