Other player can be seen floating above the ground ( 4-10 meters high ) a second, but long enough to reveal his position.
It happened twice in CLASH mode (90% sure), but not the same day and within the first minute of the round, but not immediately after respawn.
1st - While playing - It was an ally running down a somewhat open hill, (not much rocks or vegetation).
2nd - While spectating - It was an enemy. He was at the 2nd story of a small building and I saw him (completely) outside at approximately the same high as the 2nd story floor.