I usually sneak up alot.
I run if i have to, not smart lingering around with a basi, but if i see an easy escape nearby, if jump around alot and try to dodge at the same time as i try to get a grip on them.
sometimes, i have taken groups of 3-4 humans alone, with a basi.
keep moving around alot, if you are seen, and use the wallwalking for walljumps.
try constantly to make the human loose sight of you, run around corners and up in roof and so on, even if a human has seen you and know you are there somewhere, you can still sneak up on him, even if he has a helmet, but then you've gotta be real fast.. (the radar lags)