Grappling hook overhaul

Currently raiders use hook like almost teleport portal on different level. one person gets hooked and WHOLE army is in second level in second. so no chance to cut line, even that there is option for it. Would change that they get either one at time that line up or that only one person can use it and after use, cut off or something. So there would be even little chance to defend against grappling hooks. thank you