Can I misty step and place bag of holding inside another bag of holding in the same round (i.e. same time)?

The question is if placing bag of holding inside another bag of holding opens the gate to the Astral Plane (which was discussed here: Is it possible to stuff a Bag of Holding inside another Bag of Holding?), then – can I make misty step before the gate has opened? For example a character runs toward the monster, puts bag of holding inside bag of holding and makes misty step before being sucked through this gate?