There might be a significant difficulty spike in this mission especially if you completed 'Birds of a Feather' with pure stealth. It is just a pure shoot-em-up. However, you have lost your MB-150 both in Story and Mission modes (that said, you can select more weapons in the latter). When you play Bangkok Part 1 the first time it will be in Story Mode, and then this level will automatically load (again, still in Story Mode). There are a few required kill types, which ultimately will be necessary to unlock the KemSynth Tower and Sana Yemen bonus levels.