Human beings do tend to lack instruction manuals, and that can complicate things¹, but no long-term damage this time. "Oh, doing miserably was a given. I'd guess it's somewhere in the neighborhood of fifty games before someone starts doing slightly less miserably." He places a stone.

¹If Grantaire did have an instruction manual, the troubleshooting section probably would have just said 'toss him in a room with Enjolras for ten minutes, he'll be fine'.