iskander stopped

"I am Rider. I have predominance over the other Servants going by foot, you know?"

With that exaggeration, Rider drew the sword at his waist out of its scabbard. Realizing that he was about to call out that Noble Phantasm, Waver stopped him confusedly.

"Waitwaitwait! You can't do that here. You’ll blow up the house!"

- Fate/Zero: Act 2, Part 4