Employees were removing hydrogen seal casing using a c-beam to rig it out of its position. The work group had the seal free and floating while attempting to prevent it from being damaged. The c-beam made contact with the end shield without the employees realizing it. They verbally gave a crane operator the signal to cable down, and when he did, the seal came toward the group with more force than expected. The seal casing hit one employee's right hand on his little finger, resulting in a fingertip amputation.