Emea group B

Can somebody explain to me why Navi got eliminated when they were -1 to the M3C -8?
I really don't understand classifcation..

h2h

NA brain strikes again
thats the 7th time someone asked

head to head m3c won against navi
head to head comes b4 round differential
unless big won
but big lost
so...

its head to head > round diff

that really weird... better team got eliminated ...