10...Nf6 then just 11. Bxb6+ axb6 Qe2
Caro Kann Ng5 trap
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yup white wins the queen with check.
6.) ...... Qb6 probably better if Black deploys the queen on that square immediately
5...Ngf6 is still fine, though it's a tricky move. 6.Bc4 and black must lock up his Bc8 for a bit. The only other thing in the given line is 8...Ngf6 and white picks up the bishop's pair.
But nowdays,Caro-kann defence is not so popular.
This is a trap in the Caro kann were black loses if he's not careful