There IS some guidance on the differing speeds issue:
If you have more than one speed, such as your walking speed and a flying speed, you can switch back and forth between your speeds during your move. Whenever you switch, subtract the distance you've already moved from the new speed. The result determines how much farther you can move. If the result is 0 or less, you can't use the new speed during the current move. For example, if you have a speed of 30 and a flying speed of 60 because a wizard cast the fly spell on you, you could fly 20 feet, then walk 10 feet, and then leap into the air to fly 30 feet more.
Mistwell
2022-03-11 18:28:50 +0000 UTC
Yes. To combine flight and SG, either someone else needs to cast fly, or you need a non concentration flight option (theres a number of options)
Treantmonk's Temple
2022-03-11 00:58:36 +0000 UTC
Flight spells usually require concentration as does Spirit Guardians, right?