The preposition fan 'from' is used to introduce ablatives. As can be seen here, it may combine with the general locative/directional postposition anga where the ablative is a location. For comparison, note also the example which shows the use of anga to express at-rest location.
Source: Kouwenberg 1994: 208
Source: Kouwenberg 1994: 594
Source: Kouwenberg 1994: 207