Stimulated Battle!
Usually, these vicious traps should have killed at least two people and left the remainder alive but riddled with injuries. However, the intruders managed to leave without a scratch. In fact, after the aphrodisiac started to take effect, other than the discomfort they had to endure, their speed increased greatly.
They had not reached the final swelling state which could kill them. Therefore the aphrodisiac instead aided them by increasing their fighting ability and enabling to get past the traps which they would have otherwise experienced difficulty getting past.
The phrase "eating aphrodisiac makes a fierce tiger" was fully reflected here. More accurately, they were so fierce, it was extremely terrifying. However, it has actually been part of a trap designed to slow them down and they had actually not taken it of their own accord.