Espy and Run into

Espy verb - To make note of (something) through the use of one's eyes.

Run into and espy are semantically related In some cases you can use "Run into" instead a verb "Espy".

Run into verb - Collide violently with an obstacle.

Espy and run into are semantically related in happen upon topic. Sometimes you can use "Espy" instead a verb "Run into", if it concerns topics such as lay hands on.