I'm not sure how the timing works out ... so not sure if this is do-able
Response: Kneel 8 influence and remove DP from the game (cannot be saved) .....
Discard attached character from play (cannot be saved) WHEN you kneel DF to pay an influence cost
In an extreme example, what happens if I have 2 DFs attached to DP and trigger his response
Do I pay the cost in one hit - i.e. kneel the two DFs and remove DP from play - and thus cannot discard DP as he is no longer in play?