Smelling the wrong rat

If white waits with castling, but black does not, we might get the following position after 1.Nc3 O-O 2.Nd5 g5 3.Nxg5 Nxd5 4.Qh5

Black to move

r1bq1rk1/ppp2p2/2np3p/2bnp1NQ/2B1P2B/3P4/PPP2PPP/R3K2R b KQ - 1 4 

GM Simon Williams, who comments on The Art of Attack, goes astray here, since he judges this as being a devastating attack for white. But black can save himself here by 4. ... Qf6

So it is easy to become over-optimistic while you are attacking. Even grandmasters like Williams and Vukovic can be wrong. If they play against mister Stockfish.