Sometimes your friend might be making a bunch of noise - maybe there's a crying baby, or they're asleep and snoring, or maybe there's just too many conversations going on. You could mute them to help you hear... but it's easy to forget to unmute them later, particularly if you have nameplates off. Having an option to mute a player _without saving the mute serverside_ - that is, taking effect only until either you or the mutee changes instances - would be helpful for these situations.
たまには、友達からでもすごい雑音が入ることがあります。たとえば、赤ちゃんが泣いたり、いびきが立ったり、或は単に会話が多すぎて聞こえない場合がある。そういう時はミュートできるけど、解除し忘れがちです(ネームタグを消してる場合は特に)
そういう時はサーバーに保存されない、どちらかが移動するまでしか適用されない一時的ミュート機能があれば便利です。