Last week massive rally (specially on resources/energy) has been due to unwinding of massive short positions induced partially from te Fed.
Again nothing has changed and until SP500 .2130this technically is a bear market rally.
What could spook the market?
The 4 largest issues
China, if the bear rally falters (the A shares have an ultimate target of 2400/2600).
Volkswagen if the ECB and the European Investment Bank find that they have to retrieve their bond purchase/investment loan due to the non compliancy of vw behaviour.
US corporate profit falling (Alcoa, the first to release, released estimates and missed…-6.81%)
A Nato/Russia clash over Syria probably due to an accidental shoot out.