8.F10*

On the left, Black has the double threat of F6** and B10.

On the right, Black is also unstoppable:
If 9.I9 10.H9*.
If 9.K8 10.I8 11.I9* 12.H10** 13.I7** 14.J11*.

False starts:

A. 8.F6** 9.I9 10.J5 11.K6*.

B. 8.H10* 9.E7** 10.D10 11.D11.