It was business as usual for Charlie Sheen when he showed up for work on the Two and a Half Men set on Monday, just 11 days after a heated fight with his wife Brooke Mueller led to his arrest.

"He's been incredibly professional, always, but especially in times of personal crisis," Jon Cryer, Sheen's co-star on the hit comedy, tells PEOPLE. "He is solid as a rock [and] today was no different. … It's a very funny episode so it went well. Thankfully a good script can get everybody through awkward moments."

Which is not to say Sheen isn't feeling the strain. "He was in his usual good humor on read-through day but obviously with the weight of something hanging on him a bit," Cryer

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