If you had to iceblock in a duel and the enemy is very low, the fastest action you can do coming out of iceblock is actually to primary fire, almost all the other abilities have a slight delay. You might die, but you might not, and they WILL die.
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.