In an application for summary judgment: (1) A plaintiff may only file an answering affidavit with leave of court, limited to matters under Order 10 Rule 67 proviso (c); any answering affidavit filed without leave must be expunged. (2) Material discrepancies in the amounts claimed in the declaration and prayer create uncertainty that constitutes a triable issue precluding summary judgment. (3) A defendant need only establish a mere possibility of success, a plausible defence, or a triable issue to resist summary judgment. (4) A surety who binds itself as a co-principal debtor renounces ordinary surety benefits (excussion and division) and becomes jointly and severally liable with the principal debtor, thus becoming a necessary party to enforcement proceedings. (5) A mortgage bond lacking essential elements (identification number, date, registration details, conveyancer's signature, and proof of owner's authorization by power of attorney) cannot constitute valid proof of indebtedness for summary judgment purposes.