Ancient Magic Errata

Ancient Magic - We love and we treasure it!

But even the most magnificient authors makes a slip once in a while and I'm certain that little pass the collective focus of the Ars fans, so here goes:

p. 67: the Araquiel's Legacy virtue where the vis interchangeability of Herbam should probably be exchanged with Terram.

Just a question about this. I noticed, in the stats on the Mongols, that the calculated weapon totals are a bit off. Maybe I'm missing something, but the Mongol Trooper, for instance, has initiative 2 more in initiative whenever he is mounted. Where does this come from? Has it something to do with Load and Encumbrance?