The keyword is when Roy said that it's important to "let them feel like they have a gain" (near 2:34:00)

1. Justin made a deal with the exchanges and he's out to lose the exchanges' trust if he doesn't hold his side of the bargain.
2. His side of the bargain is now impossible to hold, so now Justin is afraid to lose more than his current Steem stake in future trust on the side of the exchanges.
3. Roy now has the duty to focus on this investment. That's why he's so focused on getting the witnesses to make the exchanges feel that they're getting something out of doing Justin a "favour".

What the witnesses propose as Tron's first steps toward a peaceful resolution:

What Tron proposes as the witnesses' first step toward a peaceful resolution:

• Most (if not all) major witnesses make a document where they say that the (specific %) stake vested and used to vote for them will back up the protection of the funds of the exchanges from malicious parties who would try to fork the exchanges out or harm their funds in any way.
• (Denied proposal) Reducing the power-down time as a "favour" for exchanges.

Extra points that were touched a lot:

• The possibility of exchanges to decline their witness voting rights together with Steemit Inc. and Tron related accounts after a message asserting their disinterest in participating in the Steem governance.
• A (denied) request to get a written statement from the exchanges expressing their wants from the witnesses, and what they can do for Steem in exchange.

Curious tidbit:

• Roy fake-laughs a lot whenever he's nervous or he's about to dodge a topic, question or comment.