'Escaping prisoner' is acceptable whereas 'sitting man' is not. Is there any explanation.
"Sitting" as a participle is ok. We have the expression "sitting president." This is an example. The question arises as to how you think about "sitting." "Escaping" and "sitting" are different kinds of verbs with different aspects. "Escaping" is active and conceptual "fits" with a prisoner. "Sitting" however as the idea of remaining in a chair doesn't quite fit alone with man. It needs more to help; a preposition such as "on" or "in." "The man sitting in the chair," or "The man sitting on the car." Grammatically-speaking, there is nothing objectionable about pairing "sitting" and man.