Al Smith
Mac Daddy
You never know until you tear them down .Strange as it might sound I've seen where it did almost no damage and conversely I've seen where it grenaded a piston .With luck it it isn't serious, but I wonder the benefits in hoping that the circlip busted off? That can easily destroy both a piston and cylinder, if a piece of clip gets shot up through a transfer and dragged up the cylinder wall, especially breaking a ring in the process.
Off topic but I think that Bg 85 blower I bought off flea bay for parts to get the shrouding has a blown rod .I've never seen a Stihl engine that broke a rod .Oh the pistons fly apart like a dollar watch but the rods usually hold .