الْأَوَّلُ: أَنْ يَتَنَازَعَا فِي الْفَاعِلِيَّةِ فَقَطْ، نَحْوُ: «ضَرَبَنِي وَأَكْرَمَنِي زَيْدٌ».
Translation: First: both verbs compete for the same noun as subject, as in “ضَرَبَنِي وَأَكْرَمَنِي زَيْدٌ”.
The attached «نِي» means “me” and is the object of each verb. The question is which verb governs the later noun «زَيْدٌ» as subject.