Immediately after Ekdal leaves, Gregers confronts his father about what? What is Werle's response to this?

Gregers confronts Werle with the question of why he has allowed the Ekdal family to sink so low and refers to the way that Werle and Old Ekdal are friends. Werle tells him that Old Ekdal is completely responsible for the bad business deal that has practically destroyed him.