@moonblack Slicing through the rotten hide of the creature, Trista makes it back behind Gustav as it begins to bloat and expand. The yellow magic of Gustav's quen encases the group and shields them from the oncoming spray of toxic blood and jagged bone.
The other two rotfiends are quick, however, and avoid most of the spray, attacking as Gustavo's sign dissipates. They're on the witchers in moments, one going for Gustav and the other for Trista. The female witcher is forced backwards as the creature slashes at it in rapid succession.
Looking back seems to have been the right decision, for as they heard the fight with the rotfiends, two brave drowners emerge from the tunnel behind them, looking to flank the group. Seeing that only Varrin is paying attention to them, the two creatures rush at the noble, looking to gut him before Isabella, whose attention is fixed on the fight in front, can turn around to engage.