The new Infinity War trailer gives us our best look at Thanos’ Black Order that we’ve seen thus far, which is great, but not so good for Benedict Cumberbatch’s Doctor Strange, who is seen being tortured by the group’s Ebony Maw.
It was revealed in the Infinity War prequel comics that Doctor Strange knows the location of the Infinity Stones, making him a prime target for Thanos.
This is speculation at this time, but the Infinity War trailer seems to be taking from the Infinity comic in terms of the Doctor Strange story arc.
In the comic, Ebony Maw is able to torture Doctor Strange under orders from Thanos because he knows the location of the Infinity Stones.
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Marvel Studios' Avengers: Infinity War - Official Trailer