Hypo #5

Jake Christensen and Warren Fasone lease an apartment unit in Presidential Towers for three years. After one year, Fasone decides to do a semester abroad in Somalia, as part of a team to fight pirates. He leases his interest in the PT unit to Robin Mohr for $2,000 per month while he is gone. Christensen sues for an accounting and a 50% share of the rent. What result? Why? Does Mohr's conduct matter?