Article - emphasis?

Hi guys,

I just want to check something. Let's say we have two situations:

1. My friend in his car is blocking another car. I tell him:

Don't you see you're blocking a vehicle? / Don't you see you're blocking the vehicle? Move!

2. My little sister is standing in the way of a man. I tell her:

Don't you see you're making a gentleman wait? / Don't you see you're making the gentleman wait?

Am I right to assert that either the indefinite or definite article works here, but it's a matter of emphasis?

A vehicle / a gentleman is any vehicle or gentleman (it's the act of blocking a vehicle or making a gentleman wait that counts, it could be any other vehicle/gentleman)

The vehicle/gentleman - the one that we see right there. The emphasis on is on that particular object.