Why does Jim Hawkins break a glass and mess up the tap of the rum barrel?

Jim breaks the glass and fouls the tap because he is nervous..... frightened.

"Are you hurt?" cried I.

"Rum," he repeated. "I must get away from here. Rum! Rum!"

I ran to fetch it, but I was quite unsteadied by all that had fallen out, and I broke one glass and fouled the tap, and while I was still getting in my own way, I heard a loud fall in the parlour, and running in, beheld the captain lying full length upon the floor.