A) Kneel and understand the frog superiority and your impotence to stop the mockery, since a small movement would trigger it's unavoidable movement into the water, vanishing for ethernity in the mass of water, leting you completely humilhated in despair and unwilling to breathe anymore.

B) Apply old and yet unknown techniques of cock and ball torture to an old man who was sleeping in the nearby park bench in an attempt of stabilishing dominance in the territory nearby, thus eliminating the chances of getting completely subdued by the frog which smugly sits on the rock surrounded by the shallow yet obscure waters of the lake.

C) Drowns yourself in the lake, in an attempt that everything is actually an ilusion and you are stuck in a non existent universe waiting for your enlightement to come.

D) Consult advice from the beings watching you and your agressor.

Ps: It didn't happen to me, and I am not talking to the beings who witnessed the event.