The ornamental design for the emergency tool, as shown and described.
FIG. 1 is a first side elevation view of the emergency tool of the present disclosure;
FIG. 2 is a second side elevation view of the emergency tool of the present disclosure;
FIG. 3 is a third side elevation view of the emergency tool of the present disclosure;
FIG. 4 is a fourth side elevation view of the emergency tool of the present disclosure;
FIG. 5 is a top view of the emergency tool of the present disclosure;
FIG. 6 is a bottom view of the emergency tool of the present disclosure;
FIG. 7 is a top, perspective view of the emergency tool of the present disclosure;
FIG. 8 is a side, perspective view of the emergency tool of the present disclosure; and,
FIG. 9 is a second, side perspective view of the emergency tool of the present disclosure shown in an alternate position of use with part of the emergency tool in an extended position.