"They will take River with them. They will try her power." His father and a few higher rank members in the organization thought it was a good opportunity to pit River's power against the dragon's power.
One of the reasons why they couldn't really attest River's power was because they didn't have the right opportunity to do it. It required a large place at her dispensation, just in case things went south. To receive all the impact and cushion the destruction that would ensue.
Therefore, with the East Draghar begging for their help, this could be their chance to study the true extremes of River's power, without destroying their own country.
Of course, after what East Draghar had done to Artzees country, the bargain was way more detailed than that, which included a few pacts that the East Dragher needed to obey, since Artzees country had the upper hand and was way more prepared for this type of situation.
