x1 is the "beneficiary"/intended-recipient of x2 (event/action), as intended by x3 // x2 is done for x1
A "beneficiary" here is someone or something for which something is done, and this relation may be either beneficial or disadvantageous. Consider "I poisoned the cake for him" vs "I baked a cake for him" ("for him to eat" would be a purpose/goal). See also be'ei, kosmu, terzu'e, selxau