There are no gargoyles where the 2nd BF key is. you don't have to kill them.

http://beyond.divinedivinity.net/help/act1_citadel03.htm
are you in this level and getting killed at 8? It's a dead-end alley anyway.

http://beyond.divinedivinity.net/help/act1_citadel06.htm
this is the map where the 2nd BF 1 key is

http://beyond.divinedivinity.net/help/act1_citadel09.htm

this is the map where the BF 2 key is (number 2).