There’s no ring to catch anything. If those compressor blades or turbine blades go, but especially the compressor blades, the force will send them flying out.
As another poster said, don’t sit beside the engines.
WRONG!
There is a heavy ballistic Kevlar band, at least on the RR engines, deliberately meant to stop a "blade out" incident, around the outside of the blade housing.
Rolls Royce had film of a blade out test, because the gear box was directly under the turbine rings. The test meant to try to get a handle on reducing the amount of damage to the box. It was interesting to watch everything go sideways, suddenly, even in slo-mo.