User blog comment:DarknessStriker/Which support should I choose?/@comment-6003864-20130520011702/@comment-4022742-20130521095612

You don't pop Nunu's ult for the damage, you pop it for the aoe slow and attack speed debuff which is quite substantial. Keeping your carries safe from bruisers is pretty easy if they can't even reach them.

Same as in lane, if you use your snowball correctly, it's a second exhaust on the enemy carry. That would make your Blood Boil into a free Zeal. You underestimate what just a bit of attack and movement speed can do, especially if you couple it with the debuffs from the snowball.

Nunu-Kog'maw facing Janna-MF. When you engage, you snowball the MF and Bloodboil your kog, this effectively increases your carries attack and movement speed by about Twice of that which MF possesses. This allows kog maw to dance around mf, out of range of her own AA's but still killing her where she stands. Sure the shield increases her health pool and damage pool, but even in a stand off, she can only attack once where kog can now attack twice. It'll take about 2 hits to remove her shield, another 2 to equalize the damage and another 2 to get the upper hand.

What is jana doing in this time? Well, lining up her whirlwind to try and knock up kog, who can easily dodge it thanks to his movement speed. So she has to use her slow if she wants a chance on hitting him at all. but theres a nunu in between, so if she wants to save her carry, she has to take a lot of hurt from nunu.