If a tenant needs to flee a property due to DFV, and there’s a co-tenant named on the lease, the co-tenant is still bound by the lease and must continue to abide by the lease conditions including making the full rent payments.
If the DFV survivor leaving the tenancy is due to get her part of the bond back, the co-tenant staying on in the property must make up the difference within 30 days.
This is applicable whether the co-tenant is the perpetrator or not.