Wait a moment.

Round the corner run two heavily-build men with very angry expressions and unnecessarily large knives.

So it's not the police, then.

"Hurry", says the American. "I'll - I'll hold them off. Get it to Aveugle.". He thrusts the package into your hands.

The train pulls up and the doors open.

You can:

Wait until the doors start to close then jump on the train leaving the painting on the platform.

Wait until the doors start to close then jump on the train taking the painting with you.

Say, "No, I'll hold them off, you get it to Aveugle".

Ask, " Who's Aveugle?".