Not really strange, just a 5-4-1 diamond. I would go 3-2-2-2-1 butterfly, attack him down his weaker flanks, or just the flanks.
yup, potemy is right, i won against my friend with butterfly formation. i was playing down the flanks, on defensive and counter, but someone told that counter doesn't work when your opponent has a DMC..not sure about that though, what do you think potemy ?