I have straightened out a snap swivel like those. It was the first time I flew my first midpower rocket. It had a really long body tube, so I split it in two and put a coupler and bulkhead at he breakpoint, so tha tthe "nosecone" was about 24" long. Upon ejection, the heavy nosecone aassembly reached the end of the 8 foot kevlar cord with such force that it straightened the bail/arm of the snap swivel straight as a needle and turned the round eyelet into an oval. The chute was attached a third of the way down the shockcord, so it stayed attached, but my nosecone/bodytube/bulkhead assembly came in ballistic from 1000 feet and planted itself like a javelin in the sod while the fincan drifted all the way across the field. Very embarrassing, but thankfully nobody was downrange or put in danger. Since then, I use locking snap swivels on all midpower birds and quicklinks on anything that needs more than a 30" chute.
I have since learned that the best thing you can do to prevent shocks like that, though, is to z-fold and tape your shockcord.
"Yeah, listen, listen, Sally Sparrow—gotta dash! Things happening. Well, four things—well, four things and a lizard."