Quote from OldTrader:
What possible "technical basis" could you possibly have for shorting a stock that is at a new high? By definition, the stock is in an uptrend. So in my opinion it would be a matter of LUCK if you manage to pick off the high here, just prior to a 20% downmove.
A good way to lose money is to short stocks on the new high list, or buy stocks on the new low list, unless you know something about the fundamentals that no one else does. It's clear here that you don't.
Maybe it's your lucky day this time....but make no mistake, it will simply be luck.
OldTrader