Have a player that has a build idea but I couldn't find if it's allowable by raw.
A snare crafter with a familiar. Using his action to give his familiar 2 actions then using some of the familiar actions and his own to create a snare in 3 actions. Letting him have some of his own actions still to do something that round
Activities can not be shared between creatures, and they can not be continued between rounds. The PC would have to use a full round to use Surprise Snare and no one can help them complete the activity.
That's what I figured. Didn't know if I was missing something though