We claim the ornamental design for a rescue hook, as shown and described.
FIG. 1 is a top, perspective view of the front side of a rescue hook illustrating our new design;
FIG. 2 is a plan view of the back side thereof;
FIG. 3 is a top elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a plan view of the front side thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is a bottom elevational view thereof.
The stippling shown in the drawings depicts surface texture only and does not depict color, contour, shading or any other characteristic of the claimed design.