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runscottinverse image, COBB doing a hook-slide past third. To me it looks exactly like Cobb, and is very typical of the way he slid - Cobb was an expert base-runner who did whatever it took to get to the base. This fits perfectly:
If the 3rd-baseman has the ball and is waiting for you, you either do it Pete Rose's way - run over him - or Cobb's way - slide in with spikes high.
If the 3rd baseman is waiting for the throw but it has a great chance of beating you, and especially if the throw is off-line (as it appears to be in this case), then a hook slide could work. The fact that there is no 3rd-baseman in the photo leads me to believe that the throw was off-line but when Cobb saw the fielder throw, it had plenty of time to beat him to the bag.