What happened: girlfriend was trying to punch holes in her notes to put in a binder when the 3 hold puncher slipped from her grasp and landed partially on the ipad air that was sitting face up on the desk. There is no case on it yet bc otter box/ lifeproof don't have them out yet. We immediately checked to see if it turned on. Everything checked out good and display seemed normal and all. Concern: I'm not too familiar with tech stuff, but could there be a possibility that some pixels or a bunch of pixels got partially damaged during the impact and will have a delay in showing the signs? Is there a way to check and see if the display and it's pixels are healthy? Things I've noticed: very small detail but when using a note taking app, the screen leaves behind a small thin red line when deleting words that were underlined in red due to spellcheck. (This was using the notability app). It comes and goes, sometimes I get it and sometimes I do. When I do get the red residue line, it's usually in the area that the 3 hole puncher fell on. Thank you very much!!