The full impact of Chris' words doesn't hit him. He could be referring to anything that's happened in the last thirty minutes, for all Wilhelm knows.

"Why, did you think you'd end up like the rosebushes too?"

He's deflecting with a joke. He knows Chris wasn't scared for himself; he was scared for him. Wilhelm wonders how he must have looked through Chris' eyes, a boy on the verge of tears in an abandoned garden, savagely destroying what's left, bleeding all his hurt out. Now, his fingers find fallen petals to peel apart.

"So, what were you yelling for?"

It only seems fair that Chris should share something when he's caught Wilhelm in such a raw moment.