The ornamental design for a bow blind, as shown and described.
FIG. 1 is a top perspective view of a bow blind showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a right-side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 a top perspective view thereof in an extended configuration.
The broken line showing the cylindrical rod in FIGS. 1-9 is included for the purpose of illustrating environmental structure and forms no part of the claimed design.