1st layer functions don't know anything about 2nd layer stuff. So you can't escrow 2nd layer tokens.

But you can create a 2nd layer escrow function.

You can achieve all functions on the 2nd layer just like on the first layer: it's just a different group of people running different software.

Essentially with 2nd layer, you can run one or more separate "blockchain protocols" with their own rules that just piggy back of the p2p network and transaction ordering functionality of the 1st layer. So the "trustworthiness" of a specific 2nd layer protocol just depends on how that protocol is designed. There's no reason it can't be just as trustworthy as the 1st layer protocol.