Life Exchange - Use illusions to block shots, keep distance. When you can use another illusion to teleport away. If you have ult use it and teleport to a teammate.
Vatu needs to come close to your teammates to deal signifant damage, so if you are playing cripple always keep an eye on them and cripple him as soon as he dives
With the 'BOOBY TRAP' talent, keep your mine activated near you, if Andro (or any other enemy) comes from behind you, it will do initial damage, alert you, and a little knockback making him lose some precision.