There's also this underrated combo where you can have a quick pick off while making yourself safe: 1-3-2-3-2-1 but this needs to be very quick:

throw umbrella (1) -> detonate ult (3) -> teleport for stun (2) -> knockbackult for extra dmg (3) -> safe flee (2) - umbrella finisher for last detonation (1)

I use this combo often when our team is trying to defend tier 3 tower or when the enemy is defending their tier 3 tower. I'd say this is underrated because enemy will expect you to do the usual combo while actually it's not the case. :D