I don't understand the aspect of the perfect participle e(thko/tes.
Here is the applicable part of the verse.
e)zh/toun ou)=n to\n *)ihsou=n kai\e)/legon met' a)llh/lwn e)n tw=| i(erw=| e(sthko/tes,
I would have understood either an aorist or a present participle but I don't understand why a perfect. Having stood?