You can extrapolate sense from Saber's actions, but yeah, the way they presented it here was pretty odd. Ah, so it was Saber's armor that changed its appearance. Was the Kotomine/Zouken scene significantly condensed from the novel, because that scene felt like it could have been longer to me.
The conversation with Zouken wasn't significantly condensed, but it was indeed shortened. The removed scene contains a lot of foreshadowing for the finale so it's important, but it might have been a bit too long for the television broadcast. He also mentions how he has basically zero hopes of Kariya winning the war since the very beginning, and threw him out there just to enjoy his misery.