Tnx for the explanation. I try to come up with an other one too, but since I am just working my way into it, it might be a wrong one.
GbpUsd is currently in a monthly and weekly supply (resistance) zone. In these cases the beautiful strong uptrend on D1 and H4 does not matter any more due to the strength of the HTF levels.
If you look back these levels the pair was shooting down from these in the past, so your shark was a very friendly one, congratulations!
Concerning the shark, could have been a faulty one by a few pips missed the 113 minimum fibex of XA in point C. Regardless the D point was at the beautiful 113 max extension of the shark XC.
Now there is only one concern I see, it has broken above the weekly zone by 55 pips or so and was not only the wick, but also candles closing above, indicating that this level did not work, and is removed.