I think it's just running over the cleric and not landing on top of him. That's what grappling is for specifically I think.
The SRD (
http://www.opengamingfoundation.org/srd.html) is vague in the description of the trample feat:
Quote:
Trample [General]
Prerequisites: Ride skill, Mounted Combat.
Benefit: When the character attempts to overrun an opponent while mounted, the target may not choose to avoid the character. If the character knocks down the target, the character's mount may make one hoof attack against the target, gaining the standard +4 bonus on attack rolls against prone targets.
|
And somehow beetles aren't in it.So it looks like it's just knockdown and no grapple