Many COIL experiences use English as the medium of instruction, with a mix of native and non-native English speakers participating. In some cases, it's a good idea to prepare the native English-speakers for these interactions by helping them to understand what non-native speakers may be experiencing. Redundancia is a very effective (though not free) empathy-building activity that is a great way to make native speakers more aware of the power dynamics that privilege their own contributions to discussions and more willing to be accommodating listeners in COIL/international virtual education interactions with non-native speakers. Another option - and this can be done with the whole group, not just the native speakers - is to watch a relevant film clip from the Crossing Borders Education film, "The Dialogue" (#3 of the list of clips linked above - "On speaking a foreign language") and extract lessons from it in a debriefing discussion.