LiteMount cannot mount in combat, due to restrictions Blizzard place on what AddOns can do.

It has a default set of combat actions that will dismount you, exit vehicles, or cast Travel Form or Ghost Wolf. This does not work when activating LiteMount using a macro on an action bar, due to Blizzard preventing macros from calling other macros.

There is also a special override for some situations where you can mount in combat (Tindral Sageswift, Dawnbreaker, Dimensius).

If you know how to write WoW macros, you can change the actions that will be run in combat (again, only via keybind not actionbar macro). To do so:

1. Open the LiteMount options to the Macros panel.
2. Select your current character or a character class.
3. Type your new macro into the text box.
4. Tick the "Enable" checkbutton.

If you enable your own macro, you do not get any of the default actions (including the combat override).