I'm in the Alderaan warzone and I spot a lone Gunslinger. Start to run up to him, almost within charge range and he... Drops portable cover and starts firing at me.
Snipped the rest as you are already dead before you engage due to your first fundamental error:
You were not in stealth mode.
The first (and last) sign a Gunslinger should have of your existence is your lightsaber sticking out the front of their chest.