@calebrus44Caster standing next to Mage Slayer casts Misty Step. Is caster gone before MS gets his reaction attack? The caster is gone, since the spell is intended to resolve before the Mage Slayer attack (DMG, 252).
— Jeremy Crawford (@JeremyECrawford) May 30, 2015
What about casting something like Dimension Door?
Epic Melanie
Dimensional door is a little bit more level expensive (4th level conjuration) but has the similar effect than Misty step