Mischa gave a strong reverse thrust and burned off all of her momentum.  She made sure to equalize her speed relative to the object in front of her, but once that was done, she didn't give another moment to let whatever it was roam around her ship.  She quickly sealed the bridge, closing the two heavy blast doors then closing the ladder access port a few meters behind her seat.  She kept part of her attention on the floating thing a few hundred meters in front of her, but directed most of it into opening up her internal sensors and running a series of scans.  Her other hand danced on the opposite console, sealing off all the Life Support systems, and opening all of the external airlock doors.  Whatever it was better be vacuum sealed, because if it didn't come back completely normal, she was going to freeze dry it and throw it into space.