As you go down the stairs toward the pool, 2 thugs with guns will come in behind you through the door at the top of the stairs. They appear when you step on or jump over any of the three steps at the top of the lowest flight of stairs; i.e., the ones shaded in green in the screenshot above.
You can avoid triggering these enemies at first if you don't step on or jump over any of the top three steps in the lowest flight of stairs. However, you'll have to climb back up these stairs later, so you won't be able to avoid them entirely. I suggest killing the thugs now so you don't forget about them.
If you move onto one of the trigger steps and then roll, you can shoot the thugs as they come down the stairs.
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