Throwing a tripmine grenade at a web mine from either PoE or Patrols that has them, will destroy the mine but makes your grenade float in the air. Same goes for PoE Variks Servitor as soon as he backs away fast. There's a rare glitch when your game lags, when you bring out your Ghost during this while checking inventory at the same time, you'll have your Ghost in your hand while shooting or throwing grenades, to stop this, just bring out your Ghost again.