Also I did not think I could move and Charge. that is what i would had done then... becasue you said they turned a corner 50 feet away... I can only move 30 feet... so I assumed i coudl not see the enemies behind the corner which would still be 20 feet ahead of me.

If move and charge is an option (and I dont see a lot of kobold waiting for me), that is probably what I would do (I dont mind if you keep my action as is too)