As for gesture stabbing. If I see gankers and they do a gesture of any kind, I try to put on my Hornet Ring and try to go for OHKO
I'm definitely out to kill the ganker, but sometimes it's stronger to lloyd's the host (can't estus phantoms, who often rely on it) and then throw out something fast like a WoG. A lot of gankers that are willing to gesture at all when I'm close are waiting for me to close distance so their buddy can do something nasty (WoG, TWoP), so I'm hesitant to charge into that. In practical cases unless I spawn on them I usually pull out a short bow harass and hang out somewhere precarious, and that seldom puts gankers in the mood to gesture .