Where a plaintiff/respondent claims that a defendant/appellant is a subtenant under the plaintiff's lease agreement, the plaintiff bears the onus of proving, on a balance of probabilities, the nature and extent of the premises covered by their lease agreement. Where a lease agreement specifically refers to a diagram or plan that would define the demarcated premises, and such diagram is not produced in evidence, the plaintiff fails to discharge the onus of establishing that the defendant occupies space within the plaintiff's leased premises. In such circumstances where the evidence is inconclusive but potentially obtainable, absolution from the instance is the appropriate remedy rather than dismissal of the claim.