You know usually if london fakes back into frankfurt its either a range or trend continuation, in this case last daily trend is up.
This bullish bar in london was a bit strong and immediately ate all the franky move, makes me nervous with short.
Best guess a range play still or we spike higher in the news and come back down, but that means a blown stop loss on the short. So staying away from the shorts.
If you must go short wait for a bar close on 15 min with a wick above it and short there with stop slightly above that bar. And cut the trade if the high breaks. It is also important that you have a limit to the max loss you can take if a trend shows up.