A line by line critisism.
Strong start on line one.
L2: you've caught my attention, what else lies there?
L3: a cave. Setting us up, crstalline... good word, sharp and almost dangerous... foreshadowing almost.
L4: beautiful. Tell us what we need to know. Powerful short ideas.
L5: "upon him" is a big let down of suspence... just "terrible fear." will keep up movement and interest
L6: how about: "a crash, metal screeching"
L7: nooo you've got to be forceful! this is the climax! "or so it seems" cuts it off to early. maybe just "A crash?"?
L8: good line
L9: perfect.
L10: take off "silent" to keep us moving into the next line
L11: "a" and "and a" can be removed for more action and movement
L12: I'm smiling
L13: perfect.
L14: ahhh... sum it up sum it up... yes...
L15: we hear it it
L16: disapears, then
L17: silence again.
I love it! I do have a habit of ripping apart poetry though, especially when it's already so so good! You gotta do some more.