Then entered Satan into him (tote eisēlthen eis ekeinon ho Satanas). The only time the word Satan occurs in the Gospel. As he had done before (Joh 13:2; Luk 22:3) until Christ considered him a devil (Joh 6:70). This is the natural outcome of one who plays with the devil.
That thou doest, do quickly (Ho poieis poiēson tacheion). Aorist active imperative of poieō. “Do more quickly what thou art doing.” Tacheion is comparative of tacheōs (Joh 11:31) and in N.T. only here, Joh 20:4; Heb 13:19, Heb 13:23. See the eagerness of Jesus for the passion in Luk 12:50.