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@Dammit
I believe (but will let someone more qualified than me answer definitively) that if the chain is too short, and you are in large to large ring/sprocket, then you put the mech under pressure which it cannot cope with, leading to it possibly failing- by snapping and then plunging into the spokes.
This is generally bad news, for the mech, wheel and frame. Possibly also the rider, if he or she was not expecting the rear wheel to lock up at that point.
But you have a triple- just avoid the big ring until the new chain arrives. Sorted.