Beware, Mal'dambas snake travels much longer than his LMB attack.

Check his loadout and his items. Resilience is generally a logic counter if he has both deft hands and >15% reload card in his deck.

Generally, don't aim at Mal'damba when you activated your Ultimate, he will just slither past you straight-forward

In order to avoid his snake stun, use your escape ability to the left or right. Don't draw back, since his snake travels much longer than his LMB attack.