on rightclick holding a feather:
   player is holding a feather named "&eLeap &2READY"
   remove feather named "&eLeap &2READY" from the player
   add feather named "&eLeap &25" to the player
   push the player in front at speed 1.6
   play raw sound "mob.wither.shoot" at player with pitch 1 volume 1
   apply speed 1 to the player for 7 seconds
   apply invisibility 1 to the player for 7 seconds
   apply haste 2 to the player for 7 seconds
   wait 1 seconds
   remove feather named "&eLeap &25" from the player
   add feather named "&eLeap &24" to the player
   wait 1 seconds
   remove feather named "&eLeap &24" from the player
   add feather named "&eLeap &23" to the player
   wait 1 seconds
   remove feather named "&eLeap &23" from the player
   add feather named "&eLeap &22" to the player
   wait 1 seconds
   remove feather named "&eLeap &22" from the player
   add feather named "&eLeap &21" to the player
   wait 1 seconds
   remove feather named "&eLeap &21" from the player
   add feather named "&eLeap &2READY" to the player
   play raw sound "mob.wither.shoot" at player with pitch 0.9 volume 1

on player drop a feather:
   if player has haste:
      cancel event

command /Assassin:
   description: アサシンもらえる
   permission: skript.test
   trigger:
      add feather named "&eLeap &2READY" to players