Find the losing move! roln111 vs twoeye

First feeling: "twoeye" was completely destroyed. But, it's not true. "Roln111" was very lucky!
Can you find the fatal mistake, made by "twoeye"?
Please post your answers here. I will add my own answer in few days - I am sure, that it was possible to kill "roln111" and finish the game quickly!

Update: Black's biggest mistake - defending the stone at H7 - ladder was good for Black, so no reason to defend here