Discuss and plan this with your dive buddy(s) prior to the dive. In some cases it will make sense to surface in place and regroup and others it makes sense to head back to a predetermined point, such as the last attraction, last turn or tieoff, anchor line, or exit point to either regroup at depth or surface and regroup. The key is for the team to be on the same page and do the same thing. If you have one guy surface in place after a minute and the other goes to the last attraction and waits a while, this will not work well for anyone.