Tonton Streaming Carmilla (2014) S1E34 - Do Not Go Into The Light

Laura's kind of emotional meltdown is stopped when she realizes that they could use LaFontaine's urge to join the party - a.k.a. the ritual - by letting her go and following her into the decisive battle. Gathering the troops, she hopes that Carmilla will fight on her side - with unpredictable outcome for all of them.