meh

it all depends on your history with villain. if he s been aggro and you ve been tangling I like a call

if you have no history of confrontations i can find a fold. Thing is, his bet only makes sense if he thinks you re a fish and wants you to "think he's bluffing". Very tough to give advice here imo. Other thing to consider is you're obviously scared here, so he almost HAS to bluff if he s not horrible...