This is an OFFICIAL comic, from the website of the card game. According to this, Cyrus is mad because the grunts made friends with Dialga before he could.

…I think whoever drew this sort of missed the whole “emotionless” thing. Although to be fair, he’s not nearly as good at hiding it as he thinks he is.

Now, consider the position of his hand in the last panel, and the force he’s got to be using to crush that wall. He must have tendons of steel.

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Thanks for the submission!