I noticed this happening in several scenario & spec-ops missions namely, first the sound of an approaching spiderbot was heard, then it appeared in the distance, went behind some obstacles and then suddenly it was already in front of the cover. As in it simply blinked in. In some cases, the bot didn't even pause but just ran and exploded against the cover, inflicting damage, which in turn led to waste of medpacks in some cases.
The HKs, Termies and garden-variety spiderbots are already grave hazards to the health of Resistance operatives but teleporting spiderbots? Seriously? Is it a bug or just a hiccup as the phone processes the game data?
iPhone 5 user