The normal rule is that in any litigation the rights and obligations of the parties are adjudicated upon as they obtain at the commencement of the lis. But this is subject to an exception. Wherever subsequent events of fact or law which have a material bearing on the entitlement of the parties to relief or on aspects which bear on the moulding of the relief occur, the court is not precluded from taking a cautious cognizance of the subsequent changes of fact and law to mould the relief.
Remesh Kumar v. Kesho Ram [1992 Suppl. (2) SCC 623]