In fact, if you simply waited until M15 ended its swing up and then checked for the relative location of the high, I think that you would likely have been selling, not buying.
You can see that clearly, H2 is in a down swing with M15/M30 making either a rally to sell or an attempt to reverse the H2. When M15 turned down at the red vertical, the up move is potentially over; this is confirmed when M30 turns down as M15 crosses down on it. That is the signal to check for a selling opportunity, not buying.
If you were already long during the rally (yes, in hindsight it is a confirmed rally), then as M15 turned down with a lower high, you would already be considering whether to begin cashing in the long positions or how much you are willing to give back (or even go into drawdown) as the down continuation progresses.
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