What to do with the stock that's delisting

My husband has the stock which is

VelocityShares™ 3x Inverse Crude Oil ETNs linked to the S&P GSCI® Crude Oil Index.

He got a text message saying that they decide to delist the ETN.

Should he sell all shares asap?

He's not really proficient at trading and once he buys he usually does not look at it so he was surprised after getting the text about the delisting.

Please give us some advice how we can deal with this situation

Thank you.

Talk to velocity they should let you know more, whatever you do....don't get rid of it now