Oh right weird camera angle. Thought those kills were from you hitting them with your gun somewhere and the nade might have done enough damage but the damage came from the nade only. Probably needed more damage. Junkrat triple is usually 3 full kills so you need more damage ontop of the assists.
Ana PotG will get even more rare now. Was really close though. Was looking at my last
Ana PotG (a month ago now RIP) and was pretty similar. 3 kills, nano'd somebody and some healing.
Meanwhile me who only just finally managed to get like 10SR higher than my PS4 rank after 1.5 seasons of PC play. From just outside top 500 in S1 and the start of S2 to 3441