The ornamental design for a helmetshield, as shown and described.
FIG. 1 is a front, top and left side perspective view of a helmet shield showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a left side view thereof.
The bottom plan view of the helmet is omitted since it is unornamented and forms no part of the claimed design. The broken lines illustrate portions of the helmet shield and form no part of the claimed design. The dash-dotted lines denote the boundary of the claim and form no part of the claimed design. The entire shield is transparent.