Vasile Stancu wrote:they needed to devise some 'method' (τὸ πῶς...) to accomplish that [=ἀνελεῖν αὐτόν]
I agree with you on this point. It seems that in the initial arrest stage they needed the people to be out of the way.
Lk.22:1-6 RP wrote:Ἤγγιζεν δὲ ἡ ἑορτὴ τῶν ἀζύμων, ἡ λεγομένη Πάσχα. 2 Καὶ ἐζήτουν οἱ ἀρχιερεῖς καὶ οἱ γραμματεῖς τὸ πῶς ἀνέλωσιν αὐτόν· ἐφοβοῦντο γὰρ τὸν λαόν.
3 Εἰσῆλθεν δὲ Σατανᾶς εἰς Ἰούδαν τὸν ἐπικαλούμενον (NA/UBS: καλούμενον) Ἰσκαριώτην, ὄντα ἐκ τοῦ ἀριθμοῦ τῶν δώδεκα.4 Καὶ ἀπελθὼν συνελάλησεν τοῖς ἀρχιερεῦσιν καὶ στρατηγοῖς τὸ πῶς αὐτὸν παραδῷ αὐτοῖς (NA/UBS: αὐτοῖς παραδῷ αὐτόν). 5 Καὶ ἐχάρησαν, καὶ συνέθεντο αὐτῷ ἀργύριον δοῦναι. 6 Καὶ ἐξωμολόγησεν, καὶ ἐζήτει εὐκαιρίαν τοῦ παραδοῦναι αὐτὸν αὐτοῖς ἄτερ ὄχλου (NA/UBS: ἄτερ ὄχλου αὐτοῖς).
Phrases introduced by τὸ πῶς occur twice here, and it seems that the aims of both Judas and the high priest and scholars (of the Jewish law) were very similar. The τὸ πῶς... is the way forward with their plan(s) that they wanted to get on with. The ἐφοβοῦντο γὰρ τὸν λαόν of verse two is paralleled with the ἄτερ ὄχλου (without the people (knowing / interfering) in the phrase ἐζήτει εὐκαιρίαν τοῦ παραδοῦναι αὐτὸν αὐτοῖς ἄτερ ὄχλου in verse 6.
Vasile Stancu wrote:and generate thus the public perception that their action was a legitimate one.
I'm not sure what you mean by "generate ... the public perception".
I read that as they wanted to not allow the populace to have any knowledge of the arrest because it was not legitimate. Does anyone have an idea of whether the arrest was a legitimate one under Jewish / Roman law?