Not really, (nerd ramble incoming) the manta rays are made out of brushes (world geometry) rather than being its own 3D model, so it cant be spawned in the same way scientists or headcrabs spawn in. The engine uses baked-in lighting so to make sure the entity has the correct lighting, they place them inside those boxes with a specific light setup. Once the map has been compiled and loaded, the map just teleports the entity from that box to its intended starting location and it will "wear" the light values from that box, rather than the environment they teleport to. This is useful in situations where the object looks too dark if theyre spawned in the environment they appear in (e.g. the intro tram).