Everyone's is different. I tore mine on March 16 2012. I got up grimacing and hobbled to rec league basketball bench. Everyone including myself said the same you did. No way it's an acl or you would be down crying I was like yeah but this must be worst sprain of my life. When I called into work on Monday and told them I'd be out awhile as I climb utility poles walking with a limp would keep me from that. There policy is use insurance and get Mri. By that night they got me one and radiologist spilled beans before KOC could even get a look at my knee. I couldn't believe I could walk on it. Also remember Eric Berry hurt his knee left and came back in and that's when they knew his torn. Now granted that's rare but nothing is conclusive until doctors see mri unless it's visual damage like Paul George, Marcus Lattimore or Kevin Ware.