if you have your ult you can throw the bubble in a area and the ult in other that she might be, the ult will block some vision and will make her screen shake a little, but do not enter on a long range fight, close to a mid distance to have advantage

It´s really normal a koga dashing towards you, he dashes and shoot, so take your time to scoup and when the next dash ends you fire ( but you need to see his pattern )

Using the bubble talent with DR and some life rip can make you tougher to kill , if a flank is next to you he is going to fight you w damage of the bubble , your selfsustain and DR (15% minimum)

if you have your ult you can throw the bubble in a area and the ult in other that she might be, the ult will block some vision and will make her screen shake a little, but do not enter on a long range fight, close to a mid distance to have advantage