Can you target your teammate's unit with Flash in a 2v2 game, and if so, where does it go?

Ruling: Yes, you can target your teammate's unit with Flash. When a unit is instructed to move "to base" without further specification, it moves to its controller's base, not the spell caster's base.

Sequence:

• Flash can target up to 2 friendly units (including teammate's units in 2v2)
• Each targeted unit moves to its own controller's base
• Your units go to your base, teammate's units go to their base

Nuances:

• The templating "to base" is ambiguous but interpreted as "to their respective bases"
• This triggers abilities like Traveling Merchant that care about moving to base
• This is consistent with Portal Rescue being errata'd to prevent stealing teammate's units
• The lack of errata on Flash (unlike The Syren and Unforgiven which specify "its base") suggests the current templating is intentional