User blog comment:BringOnTomorrow/Optional NPC Behavior/@comment-110.22.126.147-20150531005012

Just like some other creatures, they arr curious to light, which draws their attention to the cyclops and seamoth, ive also noticed how they seem to detect the player in a cyclops, then they continuously press against it, in order to complete their attack sequence (grab&bite). The A.I programming of the reapers definitely has room for improvement, and on that note, they ARE directly focused on the player, it's just that they find themselves hard to maneuver with their massive body, which the developers will hopefully fix in the upcoming updates