Please do not attempt to make the mouse bleed. Not only is it cruel (just because they are food does not mean they ddeserve to be abused and suffer) but as anna pointed out, a freaked out mouse is a lot more likely to harm your snake.
A defensive strike doesn't mean the mouse was doing anything aggressive, it could just be your new snake is telling it to stay away. From the sound of it the snake might not be gungho on eating tonight. I would probably opt to put the mouse in a container with some food and water. Give it a few (3-5) days and try again.
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