Why no one talking about Amumu and Mordekaiser?

I witnessed today morning, 02:00?, two completely broken amumu was a fuckin beast.

Was he fed? Yes, but still... an outworldly damage O_O I didn't had any magical defense either but

He Q'd into our team, I see my health go from 1.900 to 60/50% -- I was playing gangplank AP, I use W, get back to 90% health, then I was 0'd somehow HOLLYYYY SHHTTT, he did that to everyone around him. Killing faster then a fed katarina - NO JOKE, it was like putting butter on the sun, and he was at about 600ap

I was surprised how I hadn't seen it before given the damage that thing is doing...

Eventually, he Q'd in, I was dead before I could hit W or Seraph's shield. (And I was pretty quick given the jolt I had)

And then, when Amumu left the spotlight for a bit it gave me room to awe at Mordekaiser, who was 3-6 fair decent ammout of last hits with a Rabadon, Will and boots.

1st - Wtf is that shield? People complain about Yatzuo :c 2nd - Also one shotting me .

The reason of this post being -- I've seen fed champions, I understand and never made a "Nerf riven, nerf kata" thread, because you see them and kinda expect they do that.

But in the last few days I haven't seen one Amumu and Morde like today earlier. Srsly, Amumu was worse then kata in AoE damage.