Take a look at this poem, and see if this helps: http://www.bigeye.com/donotgo.htm
The woman has had a hard time with her husband suffering a serious dementia, so she is devastastated. Mel said "it could be a fate" and when she said "mine won't go gently", does it mean "My fate won't go smoothly"?
Is mine "my fate" and gently "smoothly"?
mel- I think my husband might say it's fate.
Woman- Fate or not, mine won't go gently.
Mel- No. But you'll be right there to hold his hand.
But you'll be right there to hold his hand." , does "holding his hand" mean you will hold his hand at bedside when he's dying?
For this episode, you can think of it as "having an easy and peaceful death." She doesn't think his death will be an easy one, but Mel says she'll be there to give him support until the very end.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.