Probley used loctite on the bolts (I do) - Just use a socket with a long extension bar or link a couple of ring spanners together to get more leverage and force it until they undo. You will not wreck anything as the bolts are in steel and the bolt will strip before the thread in the frame will - but I doubt either will happen - they will come loose with enough force.
Gee I thought kle engines dont leak - I have not seen a leak on em yet. Is it using oil noticeably? If so you definitely have a serious leak.
The leak visually is under the water pump but that may mean nothing, and you would probley leak coolant before oil. Doubt it would be a case leak.
You really just need to get the pan off clean it all up - take it for a ride to get hot and park it on concrete and watch for leaks...
Dont waste your money with the shop, just rip that bash plate off...If necessary re-tighten case bolts with a small socket/spanner to avoid stripping bolts.