You could be civilized and debate your opponent openly
If you really feel strongly about things, you could
challenge your opponent
to box under the Marquess of Queensbury
rules
You could settle the
issue with a gentlemanly pistol duel (no longer legal in
many places) where at least you face your opponent at the moment
of truth
Or you could plot with others and approach from behind Et tu (.....)
[fill in the
blank]
One of the ways above is underhand, atesticular, and lower than a snake's
belly