Will Frictional Games make more Sea/Air monsters?

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How are you going to make an aerial monster move into the air and such? What if there's an obstacle?

...well Skyrim did it. On a more serious note - so did Drakan: Order of the Flame, in 1999 no less. Now obviously, HPL 2 isn't up to such a task in its current state, but I guess if they wanted to have that feature in HPL 3 they would theoretically be able to implement it.