There's loads of things to worry about if you are a bear such as valuations, China, US yield curve flattening, economic woes in Europe, the recent collapse in freight rates etc. Here is an apt summary of these views from the pro's:
Things to Worry About as a Bear
Russia’s Turtle Tanks Might Be Mine-Clearing Breaching Vehicles
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In the breaching role, the bizarre do-it-yourself vehicles appear to work
just fine.
8 minutes ago