Because of overlapping arrays and Blake's lack of skill, they couldn't directly disable the arrays in charge of the traps and alert the owner of the facility, so they had to take down all the arrays piece by piece.
[3 more to go, take a rest, and when you are ready we continue.] The system gave him a break after seeing him sweat.
The next was the trap and alarm arrays which were quite tricky. The alarm array had 19 nodes while the traps had 26 nodes making it a total of 42 nodes, but the tricky part was that both of them were interlinked.
Disabling the traps would trigger the alarms informing the owner of their presence which most likely meant death and vice versa.
Also if Blake wasn't careful enough to not trigger the traps, the nodes would shoot high-powered beams of energy that would turn him into a human sieve meaning every option apart from success led to death.