The target must pass the Saving Wisdom save roll or follow the command on his next turn.
If you had to launch Command as a reaction (for example, prepared action or opportunity to start a war) on the turn of the spell's target, will the spell's effect take place immediately or in the next turn?
for example. If I held the command spell and triggered it when an orc appeared at the street corner and told him to "crawl", would that end the turn of the orc or lorry? Orc will complete his turn without being affected, only forced to crawl to the next turn? ?
Grovel: The target falls flat and then ends his turn.