My opponent plays Nico's Teaching to steal my Hero. I then play my own Nico's Teaching to take that Hero back.
1st Q: Can I do this?
2nd Q: Does the Hero retain the ability to use the Enhancement colors my opponent chose for him to use?
3rd Q: Does control of the Hero switch from me to my opponent and then back on each of our turns?
"Select a brigade and a Hero in a territory. Place on that Hero: Take Hero to your territory. Hero may use Enhancements of selected brigade. Cannot be interrupted."