Even when mounted, and moving across a slippery surface like grease (and probably ice too), both me and the mount can slip on the surface. How does a rider slip on a slick surface when his feet aren't on the ground?

A Bend in an Extinct Lava Tube

The ground is slick and greasy here.


A skeletal apparition hovers in midair.
The ground in this area is slick with yellowed grease.
You slip and fall!
Your sudden fall grazes you.
A vicious warg has arrived.
A vicious warg slips on the grease and hits the ground hard!
A vicious warg's sudden fall devastates it!

<97%hp/97%hp 88%m/88%m 100%mv/100%mv> 4 PM 9172tnl (4.46%) wilderness e
An Extinct Lava Tube

The ground is slick and greasy here.


The ground in this area is slick with yellowed grease.
You manage to maintain your footing on the slippery grease.
A vicious warg has arrived.

<97%hp/97%hp 88%m/88%m 100%mv/100%mv> 4 PM 9172tnl (4.46%) wilderness mount
You are already mounted.