“Crush his head with this poker like the claw of a lobster”

Pips convict says that when he first saw Compeyson, his former comrade, he would crush his head. This suggests that he is a violent man. However, there are connotations in this quotation too. When you think of a lobster, you think of something without feelings. This makes you think that Magwitch can kill people without hesitation. The denotation indicates that Magwitch is violent, but the connotation shows you how his mind works.