Within just a few short seconds, the president was whisked away under the mountain of secret service officers and other groups like the police officers in the area. Some died and that's what they signed up for from the moment that they thought of the job that they wanted to take as their careers.
This was something that every serviceman does in order to be accepted as one, and in this case, these selfless soldiers sacrificed their last breaths in order to safeguard the president even though she wasn't responsive.
At this time, though the mercenaries had no way of getting a confirmation about the president's current situation, others still had placed themselves on the adjacent roads so as to continue their assault.