Timesplitters 2 Easter Egg - The Old Sage

First go to NeoTokyo. Continue the mission normally. When you get hurt go back to where you get your weapons... in the alley. Go down the stairs at the end of the alley and turn right. Continue to the end of this new alley.

There the should be a little store on the left wall. If you've done it correctly, an old man gonna be there. If you talk to him, or I think you just have to get close to him, he's gonna heal you and tell you a little something to motivate you. You can do it every time you are hurt (I think).

P.S.: If he does not appear, try to get the Time Crystal first.