If a strength-4 worker would increase its strength (e.g., via being bumped or retrieved), it must hibernate. Return the worker to the general supply next to the board. Then, place a hibernation token representing that worker anywhere in the Hibernation Comb on the board and gain the benefit it covers.

ORDER OF OPERATIONS: If a worker’s strength would exceed 4 as part of performing an action (either because a strength-4 worker is bumped off an action space or for some other reason), resolve the action first (as if the worker were still strength-4) and then hibernate the worker.