I've ghost-ridden bikes many dozens of times, even with flat tires. On rare occasion, a particular tire may come off a particular rim, so ride slowly.

Ride slowly for other reasons as well. Hitting a bump may cause the ghosted bike to speed wobble and it'll fly out of control unless the front end is briefly lifted off the pavement and put back down still pointing straight. When this didn't go right, I let go of the ghosted bike with a push-away and accepted the damage as the statistical cost of doing business this way.

If the handlebars of both bikes clash, you may be hitting the ground.

Be prepared for passing motorists to jest about your stealing the bike.

Riding downhill can get tiring in a hurry, bracing one's knee against the toptube allows steeper descents while steering and braking sufficiently.

Once again, attaining speed can be dangerous in many ways.