Andy Brenner says investors are bracing for a pullback after Goldman Sachs' (GS) David Solomon and Morgan Stanley's (MS) Ted Pick warned of a potential 10-20% correction, and Michael Burry revealed a $1 billion short against Nvidia (NVDA) and Palantir (PLTR). Brenner believes the recent selloff is a short-term wobble, but if it gains steam, it could lead to margin calls by Thursday.