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I had a potenza that did something similar to what happened to you, new like a week old, getting off my driveway and cracked similar to yours.
My frame was steel and nothing happened, not even a scratch because i was pretty much 1mph, but i almost fell when the RD pretty much exploded.
My best guess after getting an RMA is that i suspect the chain was a couple of links too short, moved the group with the rma RD to another bike plus a longer chain and zero problems.
PErsonally dont like some parts in RD's made of plastic or carbon, like for example the out case for the rd spring that goes attached to the RD hanger bolt. One manufacturing problem and the sucker will crack somewhere.
Mine had a crack from side to side and the tab that attach to the RD hanger gave up I think because of the spring load. After that the thing just bye bye. Similar to yours.
Call campagnolo, they will ask for pictures but since it happened to me i do not see why it couldnt happen in a high group.
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