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I don't think it is likely at all that the chain has skipped a tooth but turning the crank pulley anti-clockwise is big no no. The chain is probably snagged. This most likely means at least one chain guide is toast.
If you can't turn the crank CLOCKWISE by hand =>
Remove the valve cover and see if you can see an obvious problem - you probably won't...
...remove the chain tensioner on the right hand side of the engine (so that's left hand side standing in front of the car looking at the engine scratching your nuts thinking why oh why?) and see if that gives you enough slack in the system to turn the crank CLOCKWISE. Use a deep 27mm socket and a long bar to get it to go.
Lots of other videos started to play after I saw the one where you see an engine and hear a click (the cat star wars one is probably the best - tree felling and bird feeding not my thing) and I got distracted - have you got a turbo or non turbo OM617?
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