Lyxen
Great Old One
For me I'm just going to suggest to the player to try a different command like Grovel if they can't go anywhere because of OAs.
It's a good way to do it, it's just that we have these table rules where we try not to backtrack and/or have discussions and suggestions like these as they really slow down play, which is why...
... indeed having some adaptability is cool and usually a lot of fun, if yu can trust your players not to abuse it in later situations (which is the case at our tables).In either case the spell isn't failing just having a different effect.