Wasn't it a shock with 〜だろう

Grammar Explanation: Presuming with 〜だろう and 〜でしょう

Rize explains that Chino’s been acting cold because Cocoa finished off the puzzle Chino has been slowly working on.

リゼ:: 「楽(たの)しみが取(と)られてショックだろうな」; “It must have been a shock to have her fun be taken away.”; Literal: “Having her fun taken away is probably a shock.”