Well .. the STANDARD way to handle this is .. just shout out a long "18 words" to fu-k those couples .. then RUN!! as that couples were sitting so comfortable .. they wont chase anyway ...
If it was me ? I will take that woman's unbrella .. and throw it aways .. see if they will go get it back ... (of course, if that guy is 6'3 then I won't do that .. )