My cousin shot a Nilgai a couple weeks ago and the Barnes Expander looked just like that hanging out of the offside of his chest. It apparently opened and tumbled to exit base first but the expanded petals hung up on the hide. A buddy shot a Roosevelt on Afognak once and caught a 300gr XLC from his 375AI in the same fashion.

I say there’s an entry hole somewhere they overlooked. If it had bled off so much speed that it wouldn’t penetrate any further than that it wouldn’t have expanded enough for the petals to hold it from falling out.