"And indeed, he saw him another time," meaning: a second time he saw Gabriel in his [original] form twice.
﴿وَلَقَد رَآهُ نزلة أُخْرَى﴾ يَعْنِي: مرّة أُخْرَى رأى جِبْرِيل فِي صورته مرَّتَيْنِ