Dean could hear all that was going on the closer they got to where the bloodsuckers gathered which was now the worst move they could pull and would now lead to their deaths. With a coven of Vampires, would be good to use some homemade bombs filled with silver and dead man's blood to cover the shrapnal to make it more effective. 

Dean signaled Sam to separate to divide and conquer. To Box in and destroy. Throwing these bombs in many directions to take out a huge majority of the coven as Dean switched with having bullts dipped in dead man's blood, picking off what the bombs didn't. Any who dared get close to him, Dean had a machete on hand and unsheathed. Dodging and decapitating. The older Winchester's face was that of stone. Giving no emotion as he fought his way to get to Evie with Sam's help.