Great Expectations

There are a ton of spots in the novel that just didn't make sense to me but I came across something a little weird. When the two convicts are found and arrested in Chapter 5, I really don't get why they yell at each other and try to put the blame on each other's shoulders.  They know they've been caught and I don't get why the book spends 2 pages just describing the two screaming "Liar!" and "Murderer!" at each other.  Any ideas?

Thanks,

Sean