Alternative ending to first session

if all the PC's are captured by the mercenaries they where wanted alive for a reason which was to be executed publicly while announcing there crimes trying to build a reputation as a savoir to this city. Dr.shoelittle is also planing on framing them for conspiracy the letters they received had magical text which only he could reveal about a plan to attack this city but it was thwarted by the Dr and he should be praised. The PC's now aware of there plan will need to escape, Bruce was put on guard duties and while frank channels the communications to the second in command through a giant illusion of his voice and body in the sky preaching to the people bellow. the players are bound by rope both feet and hands its a DC 20 Strength or Dex to escape or any fire damage or at least 3 slashing damage. while bound symatic components can't be completed and attacks have disadvantage and dexterity saves also have disadvantage and movement is reduced to 1/3rd (normally 10 ft). once they leave the stage the chase is on once more but only Bruce is perusing.