See the entire entry for bāṯarken; bāṯar kēn adv. afterwards

TgJ 1Sam24:9 :וֻקרָא בָתַר שָאֻול לְמֵימַר רִבוֹנִי מַלכָא וְאִסתַכִי שָאֻול לַאְחוֹרוֹהִי : he called out after Saul: my lord king! So Saul looked behind him

See the entire entry for sky vb. to expect, watch for