ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
P. and V. τρέμειν, φρίσσειν, V. τρέσαι (aor. of τρεῖν, also Plato but rare P.).
shudder at: use verbs given with the acc. or use fear.
P. and V. τρόμος, ὁ (Plato), φρίκη, ἡ (Plato and Euripides, Troades 1026).