Starting and drawing a panicked breath as she saw a fight against those monsters unfold, Tera backed away slowly, her hand pulling her data disk off her back. It flashed into her Keyblade as she took in the frankly horrifying sight ahead of her. The man with the gunblade, named Leon judging from the reaction of a young man that just ran by her, was battling a huge, dark armoured hulk that had backup in the form of smaller Heartless that fired fireworks out their mouths! She'd never seen such things in her life, even with the Light Cycles and the Disk Arena. 

She didn't know how to fight. But her newfound companions did.

And the best thing she did was learn. 

Tera would hang back, observing the fighters in play as they fought. Her keen eyes would focus on [b]Leon, Markus and Nero[/b] in particular, each and every move they made being analysed, recorded and stored within her memory for use. Every action, every parry, counter swing, attack, dodge, analysed and stored, just like a computer would.

She was an ISO, after all. A computer was at the heart of her very being. 

Her grip on her Keyblade tightened. A few more minutes and she'd be ready, hopefully.