He has some help, though. Shooting it works better if you smite it first. 

"I'm out of channels!" Smash smash?

Chomp.

"I DO NOT ACTUALLY AT THIS POINT PARTICULARLY HAVE THE OPTION OF TRYING HARDER TO RESCUE YOU." Arrow. Arrow. Arrow. There's technically a teleport-capable wizard with the company but his job is to get himself and Iomedae out if they're ambushed by the whole orc army and it's hopeless, and he will (entirely correctly) disobey an order to go Teleport over there and save the guy, who at this point even the slower undead are catching up with. 

Smilodon goes down to enough arrows, though.

Once he will no longer provoke attacks of opportunity in so doing he will resume running toward the horse.

There's quite a lot of undead in pursuit of him, but they're not especially brilliantly organized; it obviously came to someone's attention quite recently that he was here and that they wanted to kill him. They might be able to keep him alive for long enough for him to get to the horse. She prays, in case she should be doing anything different -

Yes, actually. She should have some spells she does not ordinarily have.

Some shadows emerge out of the ground beneath Blai and a terrible cold consumes him from the legs up as they pass through him -

Whatever Aroden just threw at her she'll cast it -

A burst of searing light explodes around Blai, killing every single undead creature in an eighty foot radius, which by this time is hundreds of them. (It will also sting Blai more than a little but slightly less than fatally.)

"Go and get him."

He's only ever seen Pharasma's high priest cast that. At a gallop, then.

WOW this planet is really something. He will be met by the gallopping knight and go cooperatively. ...he will have a problem with the anti-fear aura and keep it to himself, it's not really in the top insert-any-number-you-please most important things. It's probably tactically essential and probably remains so even if it's slowing Blai down a hair.

"I suspect it'll be a fight to get us back to the city," he warns him, pulling him on his horse. "Now that we've stirred 'em up. We would be grateful for your assistance but intend once we're safe to take you prisoner."

"Understood. May I know who is taking me prisoner, please."

There are more undead emerging from everywhere including the ground. The company's reorganizing for a fighting retreat. "This company's commanded by the Knight-Commander Iomedae of the Knights of Ozem, a paladin of Aroden, serving in the second army of the Empire." 

"Oh. I see. I'm from the future."

"I don't really believe that but I don't have time to argue with you about it right now. ....no, wait. If you were to die in the next five minutes what would be the most important things for us to know about the future."

"I have two copies of Iomedae's holy book in my bag. Aroden dies in 4606 and this opens a portal to the Abyss in Sarkoris, drowns Lirgen and Yamasa, and breaks prophecy planetwide. The forces of Hell conquer Cheliax, although as of my time a party of archmages have taken it back. In... 4640, I think, but my history education wasn't very good. The archmages are in 4713."

"....so we win? Cool." Angelu cannot actually fire his bow from horseback without the advantage of a smite, and is out of smites. He pulls his horse up with the rest of the company.

"Oh. Yes, you win, Tar-Baphon remains sealed in my present day."

The stuff about Aroden dying is bad of course but it's in the very distant future and can probably be avoided if it even really happened. Now how to ask the next question without sounding unbearably self-important. "We don't know of a god called Iomedae. Is she a god of this world, or some other world?"

"This one. The Knight-Commander ascends by Starstone."

"That seems unlikely but I'd be very happy about it if it was true." And for now less arguing more fighting.