{Himself also to walk} (kai autos peripatein). Present
active infinitive after opheilei (ought), "Himself also to keep
on walking," a continuous performance, not a spasmodic spurt.
{Even as he walked} (kath(9373) ekeinos periepat(8873)en). Constative
aorist active indicative summing up the life of Christ on earth
with the emphatic use of the demonstrative ekeinos in reference
to Christ as in  3:3,5,7,16  4:17  Joh 7:11  9:12,28  19:21 .