PS: Get used to 'husboars' expressing themselves in rumbling and rumble-strutting. In the presence of sows this is wooing/showing off behaviour ('look what a strapping lad I am') and totally harmless. Sows are rather vocal around boars; which is good to hear. They have special squeaking to tell boars to stay off but a typical whine when they are coming into season; a kind of 'stay off I am not ready - yet'. Pheromone-fugged boys usually only hear the word ready, so it can get a bit lively; but there won't be any fights, just the sows protecting their bum ends until they are ready to mate at the very end of a season.
If the boy is not getting the message, then some target pees will do. That is why the cavy equivalent to a wedding ring is generally a yellow nose.
But it is also good to see that your little lady has some spunk and can stand up to him if she needs to; even if it is only mild behaviour. Your piggies are now at the stage where they have to work out the shape of their relationship between them - dominance is actually not just about how far the top piggy can push the under-piggy but also how far the under-piggy is allowing themselves to be pushed. It is a fine dance but please do not worry about fights; they are deep into hammering out the small print of their marriage contract.
When Sows Experience A Strong Season (videos)