It works on flying but can fail (Your weapontrip seems to slide around a some mob.), see below

trip

You move out of the range of a some mob's hit.
Your defilement hits a some mob.
Your punch decimates a some mob!
Your defilement hits a some mob.
A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
His feet aren't on the ground.
A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
weapontrip

You dodge a some mob's hit.
A some mob dodges your defilement.
A some mob throws himself away from your punch.
Your punch mauls a some mob.
A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
Your weapontrip seems to slide around a some mob.
A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
weapontrip

A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
You trip a some mob up with a black steel mace and send him sprawling!
Your weapon trip injures a some mob.
You can't find the opening you need to kick a some mob while he's down.
A some mob has a few scratches.
A some mob throws himself away from your punch.
Your punch mauls a some mob.
A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
Your weapontrip seems to slide around a some mob.
A some mob has a few scratches.

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
weapontrip

civilized <100%hp 74%m 100%mv 11420tnl (-15.35%) 6 PM>
You trip a some mob up with a black steel mace and send him sprawling!
Your weapon trip injures a some mob.
You can't find the opening you need to kick a some mob while he's down.
A some mob has a few scratches.