What is the authenticity of the Hadith: "If a man seizes another man, and the other kills him, then the one who killed is to be executed, and the one who seized is to be imprisoned"? And does it clarify the ruling on the one who seized?

The aforementioned hadith is weak because it is mursal (has a missing link in the chain of narration), as it was narrated by Wakee' and Ma'mar from Sufyan al-Thawri from Ismail ibn Umayya, and Ismail is not a Companion of the Prophet.

Scholars have differed regarding the ruling on the one who holds (the victim for the killer); some have gone to the extent of saying that he should be imprisoned, while others have stated that both the one who holds and the killer should be executed.