Arya learned how to use her beloved "Needle" that she received from Robb with help from dance master Syrio. The pesky Lannisters try to kill Arya and Syrio fends them off with a wooden training sword long enough for her to escape before dying off screen.
Tis a big and beautiful world. Most of us live and die in the same corner where we were born and never get to see any of it. I don't want to be most of us.