My aggressive russian tortoise

[Subersibo]

my russian, Jack, has been displaying very aggressive behavior lately. He lives outdoors in a well planted habitat with lots of different weeds n grasses so lots of food to eat. He always stretches his neck like he's looking for trouble and runs around his enclosure a lot then when he sees my shoe or slippers he runs after me and today he was aggressively trying to dismantle my slipper biting it non-stop! The other day he bit my foot. Lol!
I also caught him ramming a good sized rock repeatedly the other day.
Is this courtship behavior coz its that time of year? He wasn't like this last year. He doesn't try to bite when I hold him though.

 

[russian/sulcata/tortoise]

russians are grumpy little creatures. some always acts like this, others calm down overtime.