“Unless and until the mortgage in this case is discharged in the appropriate way upon actual payment and acceptance of the sum due, I think that the mortgage remains a mortgage, and that the mortgagee is entitled to any surplus proceeds of sale in the hands of the bank up to the amount properly due under the mortgage. A doctrine of the discharge of a mortgage debt by the existence or unilateral appropriation of an unliquidated claim is one to which I give no countenance: I regard it as neither convenient nor just. …”
“I bear in mind the consideration that, so far as any claim against the£36,000 is concerned, the mortgagee has a secured claim to what is due under the mortgage and the mortgagor has a secured claim as to any surplus. The mortgagor's counterclaim for unliquidated damages was never a claim which was secured on the mortgaged properties or the proceeds of sale thereof, and I do not see why the court should strain to give it what in effect would be a secured position. The counterclaim may fail or it may succeed: to the extent of its success the mortgagor will have the ordinary rights of a judgment creditor against the mortgagee: and I see no injustice in saying that the mortgagor must be content with that.”
“I say nothing about the case where a mortgagor establishes that he has a claim to a quantified sum by way of equitable set-off. Possibly such a claim might have the effect of actually discharging the mortgage debt.”
“In my judgment, however, the Mobil Oil principle is applicable both where the cross-claim is a mere counterclaim and where it is a cross-claim for unliquidated damages which, if established, would give rise to a right by way of equitable set off.”