There (ekei). Out there, outside the house whence they are driven.
When ye shall see (hotan opsēsthe). First aorist middle subjunctive (of a late aorist ōpsamēn) of horaō, though opsesthe (future middle) in margin of Westcott and Hort, unless we admit here a “future” subjunctive like Byzantine Greek (after Latin).
And yourselves cast forth without (humās de ekballomenous exō). Present passive participle, continuous action, “you being cast out” with the door shut. See notes on Mat 8:11. for this same picture.