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That's not what that means. It is warning that all BULL calls could be negated if BTC takes a plunge, which is expected sometime soon, check the BTC charts and analysis by @haejin for more info on that.

Have an exit strategy ready, pool your cash together and wait for the bottom to start buying back in.

That's how I read it too. ie. BTC's drop may cause uncertainty across all alt markets.

No, what I meant is that if BTC starts crashing, then everything will also and most likely negate my bullish calls on XMR and others.