Viktor's Ultimate basically creates a delayed explosion in the place where you were standing, times three. But you can easily survive it with no damage to your health simply by backpedalling and bringing the shield up. It won't even be destroyed!
A good Sha Lin knows how to avoid Grumpy Bombs, and you should never try to fight him alone. If necessary, stay closer to your teammates and use Poppy Bomb as an escape. Just try not to get hit by Impaler Arrow - and watch your back.