According to the New Year Livestream, Columbina has a passive skill that REVIVES a fallen party member while exploring Nod-Krai, and the upcoming character silhouettes + hints suggest someone "might" die due to Dottore. Coincidence?

Im not sure the passive is lore related. They just wanted to give her something useful for exploration

Did someone die in Mondstadt as well? Because Barbara has that passive 

Sandrone to the rescue!

Chasca cutscene falling deaths are now guilt free!

the more interestign thing here is, that they haven't mentuioned anythign with this feature of hers being time limited by stupid 15 minutes, like its the case with Barbara, Dahlia and Qiqi, which have that ability only as part of their constellations, while its for Coluimbina also the very first tiem just a part of her passive !! which is huge for general exploration of the game as long your Columbina isnt dead, she literally instant revives your other party members, if they die while her Burst Effect is still active...

however, its balanced out, because its effect works onlx when the Burst is active, so they literally saw now reason to make it worser, by slapping a stupid long time cooldown onto it tzoo probably, because of its effect beign already limited to work only, when you were able to Burst with Culumbina and have its effect probably last only like 20-30s or so as time frame, where you get instant revived on death with a fraction of your health,, while in return the others revive with more health/full health..

I like it when MHY actually adds new really helpful passives to the game, other than repeatign for the x-th time some old stuff, because that increases the value of a character, if they actualyl provider also helpful useful passives, that make your playing of the game actualyl really more comfortable, or fun in the end.