Lancer was outmatched. That much could be said. The opponent standing before her was Rider; her first opponent, and in some twist of fate, her final opponent.
They didn’t see eye to eye. Figuratively, this was because they were competing to be the sole victor of the Holy Grail War. Literally, this was because Rider sat entombed with his Master within an enormous red suit of armour that towered over Lancer. Under normal circumstances, any Servant should have trembled with fear, but Lancer didn’t. She had experience with beings like this one.