They watched him there - That is, the four soldiers who had crucified him. They watched him lest his friends should come and release him.

They watched him - To prevent his disciples or relatives from taking away the body or affording any relief to the sufferer.

And sitting down, they watched him there. That is, the soldiers, after they had crucified Jesus, and parted his garments, sat down on the ground at the foot of the cross, and there watched him, lest his disciples should take him down; though there was no need to fear that, since they were few, and weak, and wanted courage, and were in the utmost dread and consternation themselves; or lest the people, who were very changeable with respect to Christ, one day saying Hosanna to the son of David, and another day crucify him, crucify him, should once more change their sentiments of him, and through pity to him rise and take him down; or rather, lest Jesus himself should, by his miraculous power, unloose himself, come down, and make his escape. It was usual with the Romans to set a soldier, or soldiers, to watch those that were crucified, not only before they expired, but after they were dead, lest they should be took down and buried; as appears from Petronius, Plutarch, and others (w). This seems to be the watch Pilate refers to, Matthew 27:65, and over which there was a centurion, Matthew 27:54.
(w) Vid. Lipsium de Cruce, l. 2. c. 16. & Lydium. de re militari, l. 5. c. 4. p. 191. Kirchman. de funeribus Romans. append. c. 9. p. 726.

And sitting down they watched him there. It was their duty to remain by the cross until the execution was ended by death.