With formality finished, Tifa awaits the "officer's" next questionable act while she slips into the groove of the rhythm; delicately bouncing her body to music before their hands light with energy she knows well. It causes the barkeep to exercise extra caution prior to use. There's no telling how it will manifest once released.

When it's retained in the hands and swung in a punch Lockhart inferences intent to strike her cherished cycle. A good guess given that's exactly what follows: a crunchy collision of fist and metal framework which sends the bike toward the unhappy heroine. 

Tifa hops to her dexter in time to evade and hear it crash into the car abaft. She stands silent, focused and thinking; thinking of how to smash the pretty face of the woman who has damaged her property: a gift from her beloved Cloud. 

Anger smolders from her heart and swirls dizzyingly through her body as she dashes at the violent vandal. What little distance between them affords enough time to prepare for reciprocation and Tifa won't strike until then. However her fury comes to bare when ire seeps from her skin in Prussian blue aura: the mark of her own spirit energy.