Let’s take a look at the applicable rules. First from the VEX Gateway Game Manual, located on this page.
Secondly from College Challenge Rules.
Thus, as you stated, teams are not permitted to enter or exit the IsolationZone. For the purposes of VEX Gateway, this means that teams are not permitted to **completely **enter or exit the Isolation *Zone. *Also, teams may not intentionally touch the foam tiles in a different zone. Reaching over from one zone to another is permitted.