To model walker’s behaviour into a clustered environment, it is inescapable to understand how a walker interacts with several surrounding elements that are simultaneously present. This work focus on collision avoidance task performed by a walker during a 1 vs. 2 interaction. The purpose of this study is to observe if a walker treats simultaneously or sequentially multiple interactions. A virtual environment experiment allowed us to compare participant’s behaviour during pairwise interaction and during a 1 vs. 2 interaction. The different walking adaptations between these two kinds of interaction allow us to state that participant might have performed simultaneous treatment to interact with two virtual walkers. But simultaneous treatment isn’t observed in all trials with two virtual walkers to avoid, so futur experimental protocols have to be set up to highlight factors that influence walker’s behaviour during multiple interactions.