Yes!

You decided to try your luck, is not like you are doing something iligal, you are 18 now.

"Hey, I'm gonan check something" you tell Mark "I'll be right back!"

"Sure, do you want me to..."

"NO!" You almost scream before clearing your throat "I mean, It's just a sec. I'll be back before you notice!"

He gives you a weird look, probably thinking you are crazy before looking back at the sneakers.

You let out a sigh before walking as normal and non suspectful way you can before turning the corner and basically srpingting out of your friend sight.

Time for a little shopping.