It was a day where you're training with him, in a place not far from Dilhade. When you launched attack using blade at him, he was able to counter it with the same blade.

You and him had a little chat and he replied wanted to shut you up. Without realizing you mumbled, "If you want to shut me up, then drill that sword into me!" Since the adrenaline is taking you up too much that makes you started saying randomly.

In which, that sounds ambiguous as his eyes widened a little in pure shock.