50% is not a fib number but it does often represent a balance point on intraday trades. I personally don't use it but have trading friends who do...and effectively.
I am a day trader Gasparov, my targets are modest and my stops even more so. Most days, today included, I get both long and short signals. This has simply been a largely bullish day.
I don't concern with someone else's trades, it's irrelevant. You are correct, managing the trade is the key, a signal is just a signal...whatever the components.
Actually the only certainly is Surf will be wrong and his puppets will pathetically defend him.
But that has nothing to do with actual trading, does it?