Man, it seems like an Achilles tear is the meanest injury. Like so many times athletes don't even notice it happens, then they go to do something totally normal (like get up after a routine hit/sack) and then realize they can't. Like most the time I've seen them they're not even in pain they just straight up cant use their leg correctly.
I've had an ACL tear, which left me with three screws in my knee after surgery. I was definitely not painless when it happened, it sent Shockwave of pain through my body.
Yes. Kevin Durant tore his Achilles and didn't even realize it until he finished sprinting down the court. Rodgers didn't seem to realize it until he tried to stand up. Probably has to do with adrenaline but lots of athletes seem to tear it and not realizes right away, whereas an ACL or hamstring people seem to notice immediately.