Freeze!

[Frank_Stein]

Well, grab normally has two settings between lethal and non-lethal, right? Maybe make it so holding someone up works the same, with one mode shooting immediately and another struggling to hold the person still. Make the first have a slower movement penalty with hostage, but the second someone can try to resist their way out of. Give it a red text message like "Joe Schmoe presses the gun against Urist McPubbies temple."