That entirely depends on the unfamiliar vampire you’re with! 

[memeything by vampiredevelopment]

There are a ton of different kinds of vampires out there but the scariest by far are probably those from I Am Legend or 30 Days of Night, they can’t be reasoned with at all and they don’t care if it’s a painful death either btw. So you are definitely gonna die if you meet them. 

Ricean vampires: Your survival/blood donation odds depend on the vampire, their hunger-level, and their style of getting blood. 

For example:

• Lestat can take a little drink from anyone and not kill, but when he kills he aims for major evildoers (”They’re easier, and they taste better!” so says movie!Lestat), but he does slip up and kill innocents from time to time so you should still be careful.
• Marius also goes for evildoers. Are you an evildoer? It has to be lots of evil, irredeemable evil. Not just minor evil. So don’t worry about him. 
• Louis kills indiscriminately so if he’s hunting and he finds you, well you are SOL. Unless you can talk with him a little, if he gets to know you, he can’t kill ya ;]
• Armand used to go for those who wanted to die already but how much of that was his inspiring that desire in them or they had been wanting it already is up for debate.
• Daniel um, idk…. I would assume also goes for evildoers…