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@Brommers
Sheared bolts will come out easily if it's simply been overtightened. However, it's more common in my experience for them to shear because they're corroded into place, and so won't turn in the threads. And because they won't turn in the threads, they shear when you try and turn them. In that case, quite a lot of effort can be required to get them out.
It's impossible to say whether that's the case here - you can't tell until the bolt's out - but given where it sheared I'd say it's a distinct possibility.